Bootstrap 4 navbar not collapsing or expanding - html

I am working on teaching myself web development, and I thought what a better way than to start my own personal web page.
I have run into an issue working with Bootstrap 4 and the navbar.
I can get the list, and the icon to show up when the window shrinks, but I can't get it to expand, or toggle collapse. I've even copied and pasted some code from the bootstrap documentation to see what I'm doing wrong and even then it doesn't work.
I've tried on both firefox and chrome, and on both, I am still unable to toggle the collapse with the icon button.
Here's the code:
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="description" content="Heath's Personal Website">
<meta name="keywords" content="heath, blandford, heath blandford">
<meta name="author" content="heath blandford">
<meta name="viewport" content="width=device-width, initial-scale=1">
<!--import bootstrap -->
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css" integrity="sha384-Gn5384xqQ1aoWXA+058RXPxPg6fy4IWvTNh0E263XmFcJlSAwiGgFAW/dAiS6JXm" crossorigin="anonymous">
<!-- import google fonts lobster and open sans -->
<link href="https://fonts.googleapis.com/css?family=Lobster|Open+Sans" rel="stylesheet">
</head>
<nav class="navbar navbar-expand-lg navbar-dark bg-dark">
<a class="navbar-brand" href="#">navbar</a>
<!-- Navbar brand yo -->
<button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarTop" aria-controls="navbar" aria-expanded="false" aria-label="Toggle navigation">
<span class="navbar-toggler-icon"></span>
</button>
<div class="collapse navbar-collapse" id="navbarTop">
<ul class="navbar-nav mr-auto">
<li class="nav-item"><a class="nav-link" href="#about">About</a> </li>
<li class="nav-item"><a class="nav-link" href="#portfolio">Services</a> </li>
<li class="nav-item"><a class="nav-link" href="#contact">Contact</a> </li>
<li class="nav-item"><a class="nav-link" href="#social">Social Media</a> </li>
</ul>
</div>
</nav>
<body>
</body>
</html>

Although you've imported the Bootstrap CSS, you've neglected to import the required JavaScript.
Importing Bootstrap's JavaScript and the required dependencies (jQuery and Popper.JS) will cause your navigation to toggle correctly.
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.12.6/umd/popper.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/js/bootstrap.min.js"></script>
This can be seen in the following:
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="description" content="Heath's Personal Website">
<meta name="keywords" content="heath, blandford, heath blandford">
<meta name="author" content="heath blandford">
<meta name="viewport" content="width=device-width, initial-scale=1">
<!--import bootstrap -->
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css" integrity="sha384-Gn5384xqQ1aoWXA+058RXPxPg6fy4IWvTNh0E263XmFcJlSAwiGgFAW/dAiS6JXm" crossorigin="anonymous">
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.12.6/umd/popper.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/js/bootstrap.min.js"></script>
<!-- import google fonts lobster and open sans -->
<link href="https://fonts.googleapis.com/css?family=Lobster|Open+Sans" rel="stylesheet">
</head>
<nav class="navbar navbar-expand-lg navbar-dark bg-dark">
<a class="navbar-brand" href="#">navbar</a>
<!-- Navbar brand yo -->
<button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarTop" aria-controls="navbar" aria-expanded="false" aria-label="Toggle navigation">
<span class="navbar-toggler-icon"></span>
</button>
<div class="collapse navbar-collapse" id="navbarTop">
<ul class="navbar-nav mr-auto">
<li class="nav-item"><a class="nav-link" href="#about">About</a> </li>
<li class="nav-item"><a class="nav-link" href="#portfolio">Services</a> </li>
<li class="nav-item"><a class="nav-link" href="#contact">Contact</a> </li>
<li class="nav-item"><a class="nav-link" href="#social">Social Media</a> </li>
</ul>
</div>
</nav>
<body>
</body>
</html>

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when I resize my screen size the toggler shows up but it doesn't react.
I'm not sure if the problem is in my browser or with my code.
when I run the code in a couple implementing bootstrap 5 the button works (although the navbar covers the text for some reason?).

Bootstrap : navbar doesn't close when we click, responsive issue

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If someone can help me, i'm on an Angular 9 project.
Demo :
http://jordanbretton.fr
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<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>Jordan Bretton</title>
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<meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
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<ul class="navbar-nav mr-auto">
<li class="nav-item active">
<a class="nav-link" routerLink="home">Accueil</a>
</li>
<li class="nav-item">
<a class="nav-link" routerLink="skills">Compétences</a>
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<li class="nav-item">
<a class="nav-link" routerLink="about">À propos</a>
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<li class="nav-item">
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<li class="nav-item">
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I really don't know how to fix this problem
You need to find why your aria-expanded="false" stays at true even if you click on it. Inspecting your website, you can see that all the classes are changing but aria-expanded is changing from true to true... Then all the classes go back to true instead of false.
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How to fix drop dawn button in Bootstrap

Toggle button working in pure HTML but not working in Laravel blade, I don't know why?
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Here is my code in blade:
<!-- File: ./resources/views/layouts/master.blade.php -->
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="description" content="">
<meta name="viewport" content="width=device-width, initial-
scale=1.0">
<meta name="csrf-token" content="{{ csrf_token() }}">
<script src="{{ asset('js/app.js') }}" defer></script>
<title></title>
<link rel="stylesheet"
href="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/css/bootstrap.min.css" integrity="sha384-ggOyR0iXCbMQv3Xipma34MD+dH/1fQ784/j6cY/iJTQUOhcWr7x9JvoRxT2MZw1T" crossorigin="anonymous">
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<link rel="stylesheet" href="{{asset('css/style.css')}}">
<link rel="stylesheet" href="{asset('css/responsive.css')}}">
</head>
<body>
<header class="header_area">
<div class="main_menu" id="mainNav">
<nav class="navbar navbar-expand-lg navbar-light ">
<div class="container">
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<button class="navbar-toggler " type="button" data-toggle="collapse" data-target="#navbarSupportedContent" aria-controls="navbarSupportedContent" aria-expanded="false" aria-label="Toggle navigation" ">
<span class="icon-bar"></span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
</button>
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<div class="collapse navbar-collapse offset" id="navbarSupportedContent">
<ul class="nav navbar-nav menu_nav ml-auto" >
<li class="nav-item active"><a class="nav-link" href="{{ url('/about') }}">درباره ما</a></li>
<li class="nav-item submenu dropdown">
محصولات
<ul class="dropdown-menu">
<li class="nav-item"><a class="nav-link" href="{{url('/azmayeshgahi')}}">آزمایشگاهی</a></li>
<li class="nav-item"><a class="nav-link" href="{{ url('/sanati') }}">صنعتی</a></li>
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</li>
<li class="nav-item"><a class="nav-link" href="{{ url('/contact-us') }}">ارتباط با ما</a></li>
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</header>
<div style="direction:rtl;" id="app">
#yield('content')
</div>
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<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>
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I find the answer,I just delet the app.js but still i dont know why this happen.
and do i need app.js

Bootstrap CDN not working

I am trying to embed bootstrap to an html file. I copied and pasted the links directly from their website and have also embedded the newest version of jQuery. The font styles seem to be correct, but the navbar and other classes are not working properly. Below is my code as well as a screenshot of the results.
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>Bootstrap 101 Template</title>
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</head>
<body>
<h1>Hello, world!</h1>
<nav class="navbar navbar-expand-lg navbar-light bg-light">
<a class="navbar-brand" href="#">Navbar</a>
<button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarSupportedContent" aria-controls="navbarSupportedContent" aria-expanded="false" aria-label="Toggle navigation">
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</button>
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<li class="nav-item active">
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<li class="nav-item">
<a class="nav-link" href="#">Link</a>
</li>
<li class="nav-item dropdown">
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<a class="dropdown-item" href="#">Another action</a>
<div class="dropdown-divider"></div>
<a class="dropdown-item" href="#">Something else here</a>
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</li>
<li class="nav-item">
<a class="nav-link disabled" href="#">Disabled</a>
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<form class="form-inline my-2 my-lg-0">
<input class="form-control mr-sm-2" type="search" placeholder="Search" aria-label="Search">
<button class="btn btn-outline-success my-2 my-sm-0" type="submit">Search</button>
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The navbar is one that I copied directly from bootstrap's documentation.
Also, as you can see, there are no errors in the console
You have accidently copied a Bootstrap Theme instead of the actual bootstrap :)
Try using the CDN in https://www.w3schools.com/bootstrap/tryit.asp?filename=trybs_navbar&stacked=h. That seems to work fine.
<!DOCTYPE html>
<html lang="en">
<head>
<title>Bootstrap Example</title>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css">
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>
</head>
<body>
<nav class="navbar navbar-default">
<div class="container-fluid">
<div class="navbar-header">
<a class="navbar-brand" href="#">WebSiteName</a>
</div>
<ul class="nav navbar-nav">
<li class="active">Home</li>
<li>Page 1</li>
<li>Page 2</li>
<li>Page 3</li>
</ul>
</div>
</nav>
<div class="container">
<h3>Basic Navbar Example</h3>
<p>A navigation bar is a navigation header that is placed at the top of the page.</p>
</div>
</body>
</html>
or for just the <head></head> import
<head>
<title>Bootstrap Example</title>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css">
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>
</head>

Navbar button appears much too wide, when Navbar is collapsed

I created a Navbar with Bootstrap 4. The "Logout" button on the left side in the Navbar appears much to wide, when the navbar is collapsed.
How can I fix the big "Logout" button if the navbar is collapsed??
<!doctype html>
<html lang="de">
<head>
<title>Hello World</title>
<!-- Required meta tags -->
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
<!-- Bootstrap CSS -->
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-beta.2/css/bootstrap.min.css" integrity="sha384-PsH8R72JQ3SOdhVi3uxftmaW6Vc51MKb0q5P2rRUpPvrszuE4W1povHYgTpBfshb" crossorigin="anonymous">
</head>
<body>
<!-- Navbar -->
<nav class="navbar navbar-expand-lg navbar-dark bg-primary">
<div class="navbar-brand">
<strong>Navbar</strong>
</div>
<button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarNav" aria-controls="navbarNav" aria-expanded="false" aria-label="Toggle navigation">
<span class="navbar-toggler-icon"></span>
</button>
<div class="collapse navbar-collapse" id="navbarNav">
<ul class="navbar-nav">
<li class="nav-item active">
<a class="nav-link" href="#">Home<span class="sr-only">(current)</span></a>
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<li class="nav-item">
<a class="nav-link" href="#">Test</a>
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<li class="nav-item">
<a class="nav-link" href="#">Test2</a>
</li>
</ul>
<ul class="navbar-nav ml-auto">
<li class="nav-item active">
<a class="nav-link btn btn-outline-dark" href="x">Logout<span class="sr-only">(current)</span></a>
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</ul>
</div>
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<script src="https://code.jquery.com/jquery-3.2.1.slim.min.js" integrity="sha384-KJ3o2DKtIkvYIK3UENzmM7KCkRr/rE9/Qpg6aAZGJwFDMVNA/GpGFF93hXpG5KkN" crossorigin="anonymous"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.12.3/umd/popper.min.js" integrity="sha384-vFJXuSJphROIrBnz7yo7oB41mKfc8JzQZiCq4NCceLEaO4IHwicKwpJf9c9IpFgh" crossorigin="anonymous"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-beta.2/js/bootstrap.min.js" integrity="sha384-alpBpkh1PFOepccYVYDB4do5UnbKysX5WZXm3XxPqe5iKTfUKjNkCk9SaVuEZflJ" crossorigin="anonymous"></script>
</body>
</html>
Thank you!
put the logout button in a form.form-inline like in the official docs, and the button is no longer stretched.
<!doctype html>
<html lang="de">
<head>
<title>Hello World</title>
<!-- Required meta tags -->
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
<!-- Bootstrap CSS -->
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-beta.2/css/bootstrap.min.css" integrity="sha384-PsH8R72JQ3SOdhVi3uxftmaW6Vc51MKb0q5P2rRUpPvrszuE4W1povHYgTpBfshb" crossorigin="anonymous">
</head>
<body>
<!-- Navbar -->
<nav class="navbar navbar-expand-lg navbar-dark bg-primary">
<div class="navbar-brand">
<strong>Navbar</strong>
</div>
<button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarNav" aria-controls="navbarNav" aria-expanded="false" aria-label="Toggle navigation">
<span class="navbar-toggler-icon"></span>
</button>
<div class="collapse navbar-collapse" id="navbarNav">
<ul class="navbar-nav">
<li class="nav-item active">
<a class="nav-link" href="#">Home<span class="sr-only">(current)</span></a>
</li>
<li class="nav-item">
<a class="nav-link" href="#">Test</a>
</li>
<li class="nav-item">
<a class="nav-link" href="#">Test2</a>
</li>
</ul>
<ul class="navbar-nav ml-auto">
<li class="nav-item active">
<form class="form-inline">
<a class="btn btn-outline-dark" href="x">Logout<span class="sr-only">(current)</span></a>
</form>
</li>
</ul>
</div>
</nav>
<!-- jQuery first, then Popper.js, then Bootstrap JS -->
<script src="https://code.jquery.com/jquery-3.2.1.slim.min.js" integrity="sha384-KJ3o2DKtIkvYIK3UENzmM7KCkRr/rE9/Qpg6aAZGJwFDMVNA/GpGFF93hXpG5KkN" crossorigin="anonymous"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.12.3/umd/popper.min.js" integrity="sha384-vFJXuSJphROIrBnz7yo7oB41mKfc8JzQZiCq4NCceLEaO4IHwicKwpJf9c9IpFgh" crossorigin="anonymous"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-beta.2/js/bootstrap.min.js" integrity="sha384-alpBpkh1PFOepccYVYDB4do5UnbKysX5WZXm3XxPqe5iKTfUKjNkCk9SaVuEZflJ" crossorigin="anonymous"></script>
</body>
</html>