Font Awesome is a popular icon toolkit that you can use in your web projects. Here's how to get started:
<link rel="stylesheet" href="fontawesome/css/all.min.css" />
<i class="fas fa-heart"></i>
Here, "fas" is the style of the icon (solid), and "fa-heart" is the name of the icon. You can find a list of all the available icons on the Font Awesome website.