What are the two ways to include an external style sheet into an HTML document?

<head>
	<link rel="stylesheet" href="/path/stylesheet.css">
</head>

We can include multiple link elements for different CSS files, and all of them will apply to the HTML document.

<head>
	<style>
		@import url("path/stylesheet.css");
		/* Other styles */
		p {
			color: red;
		}
	</style>
</head>

The @import rule must be at the beginning of the <style> element before any other selectors.