How To Install Bootstrap in Blogger:
First, Login to your Blogger account and make sure it's in place of the template editor
Enter the code below and place it above the code </ head>
<link href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.1/css/bootstrap.min.css" rel="stylesheet"></link>Then find the code </ body> and enter the code below directly above the code </ body>
<link href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.1/css/bootstrap-theme.min.css" rel="stylesheet"></link>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.1/js/bootstrap.min.js"></script>Then Save / Save the template
That way now your blog has been installed with Bootstrap. To understand some of the components of bootstrap,
you can visit the official bootstrap site through http://getbootstrap.com or you can also see some tutorials for Bootstrap in this category.