Bootstrap 4 has some contextual classes that can be used to provide "meaning through colors".
The classes for text colors are: .text-muted, .text-primary, .text-success, .text-info, .text-warning, .text-danger, .text-secondary, .text-white, .text-dark, .text-body (default body color/often black) and .text-light:
<!DOCTYPE html>
<html lang="en">
<head>
<title>Bootstrap Contextual Colors 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/4.5.2/css/bootstrap.min.css">
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.5.1/jquery.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.16.0/umd/popper.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.5.2/js/bootstrap.min.js"></script>
</head>
<body>
<div class="container">
<h2>Contextual Colors</h2>
<p>Use the contextual classes to provide "meaning through colors":</p>
<p class="text-muted">This text is muted.</p>
<p class="text-primary">This text is important.</p>
<p class="text-success">This text indicates success.</p>
<p class="text-info">This text represents some information.</p>
<p class="text-warning">This text represents a warning.</p>
<p class="text-danger">This text represents danger.</p>
<p class="text-secondary">Secondary text.</p>
<p class="text-dark">This text is dark grey.</p>
<p class="text-body">Default body color (often black).</p>
<p class="text-light">This text is light grey (on white background).</p>
<p class="text-white">This text is white (on white background).</p>
</div>
</body>
</html>
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The classes for background colors are: .bg-primary, .bg-success, .bg-info, .bg-warning, .bg-danger, .bg-secondary, .bg-dark and .bg-light.
<!DOCTYPE html>
<html lang="en">
<head>
<title>Bootstrap contextual backgrounds 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/4.5.2/css/bootstrap.min.css">
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.5.1/jquery.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.16.0/umd/popper.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.5.2/js/bootstrap.min.js"></script>
</head>
<body>
<div class="container">
<h2>Contextual Backgrounds</h2>
<p>Use the contextual background classes to provide "meaning through colors".</p>
<p>Note that you can also add a .text-* class if you want a different text color:</p>
<h3 class="bg-primary text-white">This text is important.</h3>
<h3 class="bg-success text-white">This text indicates success.</h3>
<h3 class="bg-info text-white">This text represents some information.</h3>
<h3 class="bg-warning text-white">This text represents a warning.</h3>
<h3 class="bg-danger text-white">This text represents danger.</h3>
<h3 class="bg-secondary text-white">Secondary background color.</h3>
<h3 class="bg-dark text-white">Dark grey background color.</h3>
<h3 class="bg-light text-dark">Light grey background color.</h3>
</div>
</body>
</html>
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