Bootstrap 4 columns not working - html

Question

I'm a student. And I have used Bootstrap 3.3.7 and after moved to v4.1. In this version, columns are not floating automatically to right. So I used d-inline-block class. I created 4 blocks with 3 of columns for each. The number of columns in a row is equal to 12. Then the last column jumps to the new line instead of wrap to the previous column. But this code works fine with Bootstrap 3.3.7. Also, I used 2 columns just for one block, and when the number of columns is smaller than 12, there is no problem. I couldn't find any proper solution on google. Please help. Thank you.
Example:
https://jsfiddle.net/EshanRajapakshe/3aeaeohb/
My code is:
<section class="popular-templates-section">
<div class="container-fluid">
<div class="col-lg-12 col-md-12">
<div class="popular-templates-title">
<h4>Most Popular Templates</h4>
</div>
<div class="popular-templates">
<div class="col-lg-3 col-md-3 d-inline-block">
<div class="template-img">
<img src="assets/images/template-thumb/template-1.jpg" alt="">
</div>
</div>
<div class="col-lg-3 col-md-3 d-inline-block">
<div class="template-img">
<img src="assets/images/template-thumb/template-1.jpg" alt="">
</div>
</div>
<div class="col-lg-3 col-md-3 d-inline-block">
<div class="template-img">
<img src="assets/images/template-thumb/template-1.jpg" alt="">
</div>
</div>
<div class="col-lg-3 col-md-3 d-inline-block">
<div class="template-img">
<img src="assets/images/template-thumb/template-1.jpg" alt="">
</div>
</div>
</div>
</div>
</div>
</section>

Answer 1

Wrap your .cols inside a .row like this
<div class="row">
<div class="col-lg-6">6 cols</div>
<div class="col-lg-6">6 cols</div>
</div>
Also remove the d-inline-block class from cols.
In your particular case:
<section class="popular-templates-section">
<div class="container-fluid">
<div class="row">
<div class="col">
<div class="popular-templates-title">
<h4>Most Popular Templates</h4>
</div>
</div>
</div>
<div class="popular-templates">
<div class="row">
<div class="col-lg-3 col-md-3">
<div class="template-img">
<img class="img-fluid" src="assets/images/template-thumb/template-1.jpg" alt="">
</div>
<div class="template-info">
<div class="template-name-type">
<h6 class="template-name">Web Design Inspiration</h6>
<h6 class="template-type">HTML5 Template</h6>
<h6 class="template-more-details">MORE DETAILS</h6>
</div>
<div class="template-price-type">
<h5 class="template-price">$78</h5>
<div class="template-type-icons">
<img src="assets/images/icons/responsive-devices.png" alt="" data-toggle="tooltip" data-placement="top" title="" data-original-title="Responsive Website">
<img src="assets/images/icons/bootstrap.png" alt="" data-toggle="tooltip" data-placement="top" title="" data-original-title="Bootstrap 4 Template">
</div>
</div>
</div>
</div>
<div class="col-lg-3 col-md-3">
<div class="template-img">
<img class="img-fluid" src="assets/images/template-thumb/template-1.jpg" alt="">
</div>
<div class="template-info">
<div class="template-name-type">
<h6 class="template-name">Web Design Inspiration</h6>
<h6 class="template-type">HTML5 Template</h6>
<h6 class="template-more-details">MORE DETAILS</h6>
</div>
<div class="template-price-type">
<h5 class="template-price">$78</h5>
<div class="template-type-icons">
<img src="assets/images/icons/responsive-devices.png" alt="" data-toggle="tooltip" data-placement="top" title="" data-original-title="Responsive Website">
<img src="assets/images/icons/bootstrap.png" alt="" data-toggle="tooltip" data-placement="top" title="" data-original-title="Bootstrap 4 Template">
</div>
</div>
</div>
</div>
<div class="col-lg-3 col-md-3">
<div class="template-img">
<img class="img-fluid" src="assets/images/template-thumb/template-1.jpg" alt="">
</div>
<div class="template-info">
<div class="template-name-type">
<h6 class="template-name">Web Design Inspiration</h6>
<h6 class="template-type">HTML5 Template</h6>
<h6 class="template-more-details">MORE DETAILS</h6>
</div>
<div class="template-price-type">
<h5 class="template-price">$78</h5>
<div class="template-type-icons">
<img src="assets/images/icons/responsive-devices.png" alt="" data-toggle="tooltip" data-placement="top" title="" data-original-title="Responsive Website">
<img src="assets/images/icons/bootstrap.png" alt="" data-toggle="tooltip" data-placement="top" title="" data-original-title="Bootstrap 4 Template">
</div>
</div>
</div>
</div>
<div class="col-lg-3 col-md-3">
<div class="template-img">
<img class="img-fluid" src="assets/images/template-thumb/template-1.jpg" alt="">
</div>
<div class="template-info">
<div class="template-name-type">
<h6 class="template-name">Web Design Inspiration</h6>
<h6 class="template-type">HTML5 Template</h6>
<h6 class="template-more-details">MORE DETAILS</h6>
</div>
<div class="template-price-type">
<h5 class="template-price">$78</h5>
<div class="template-type-icons">
<img src="assets/images/icons/responsive-devices.png" alt="" data-toggle="tooltip" data-placement="top" title="" data-original-title="Responsive Website">
<img src="assets/images/icons/bootstrap.png" alt="" data-toggle="tooltip" data-placement="top" title="" data-original-title="Bootstrap 4 Template">
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</section>
Also added the class img-fluid to imgs so it won't be bigger than its container.
Bootstrap-v4 Grid system Docs

Answer 2

Here is the updated fiddle link
I edited ur html, removed un necessary classes.
Also if u want all columns to be of same size on all devices, u only need one col-{number} class
Also there is no col-xs-{class} in bootstrap 4. Instead of that, use col-{number}
<section class="popular-templates-section">
<div class="container-fluid">
<div class="popular-templates-title">
<h4>Most Popular Templates</h4>
</div>
<div class="popular-templates">
<div class="row m-0">
<div class="col-3 blue">
<div class="template-img">
<img src="assets/images/template-thumb/template-1.jpg" alt="">
</div>
</div>
<div class="col-3 black">
<div class="template-img">
<img src="assets/images/template-thumb/template-1.jpg" alt="">
</div>
</div>
<div class="col-3 blue">
<div class="template-img">
<img src="assets/images/template-thumb/template-1.jpg" alt="">
</div>
</div>
<div class="col-3 black">
<div class="template-img">
<img src="assets/images/template-thumb/template-1.jpg" alt="">
</div>
</div>
</div>
</div>
</div>
</section>

Answer 3

You are facing issues basically because of the improper semantics of Bootstrap grid used by you. Find below the corrected code, it will help for sure.
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<meta name="author" content="Akash Kumar">
<meta name="url" content="http://akashshivanand.com">
<script type="text/javascript" src="https://code.jquery.com/jquery-3.3.1.slim.min.js"></script>
<link rel="stylesheet" type="text/css" href="https://stackpath.bootstrapcdn.com/bootstrap/4.1.0/css/bootstrap.min.css">
<script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.0/umd/popper.min.js"></script>
<script type="text/javascript" src="https://stackpath.bootstrapcdn.com/bootstrap/4.1.0/js/bootstrap.min.js"></script>
<link rel="stylesheet" type="text/css" href="https://stackpath.bootstrapcdn.com/font-awesome/4.7.0/css/font-awesome.min.css">
<style type="text/css">
.blue {
padding: 5px;
background: blue;
}
.black {
padding: 5px;
background: black;
}
</style>
<title> by EshanRajapakshe</title>
</head>
<body>
<section class="popular-templates-section">
<div class="container-fluid">
<div class="row">
<div class="col-lg-12 col-md-12 col-sm-12 col-xs-12">
<div class="popular-templates-title">
<h4>Most Popular Templates</h4>
</div>
<div class="popular-templates">
<div class="row">
<div class="col-lg-3 col-md-3 col-sm-3 col-xs-3 d-inline-block blue">
<div class="template-img">
<img src="assets/images/template-thumb/template-1.jpg" alt="">
</div>
</div>
<div class="col-lg-3 col-md-3 col-sm-3 col-xs-3 d-inline-block black">
<div class="template-img">
<img src="assets/images/template-thumb/template-1.jpg" alt="">
</div>
</div>
<div class="col-lg-3 col-md-3 col-sm-3 col-xs-3 d-inline-block blue">
<div class="template-img">
<img src="assets/images/template-thumb/template-1.jpg" alt="">
</div>
</div>
<div class="col-lg-3 col-md-3 col-sm-3 col-xs-3 d-inline-block black">
<div class="template-img">
<img src="assets/images/template-thumb/template-1.jpg" alt="">
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</section>
</body>
</html>