What are the best practices for organizing and including CSS files in a PHP project to ensure proper styling and layout?

To ensure proper styling and layout in a PHP project, it is best practice to organize CSS files in a separate directory and include them in the HTML using the <link> tag. This way, CSS files can be easily managed, updated, and reused across multiple pages.

&lt;!DOCTYPE html&gt;
&lt;html&gt;
&lt;head&gt;
    &lt;title&gt;My PHP Project&lt;/title&gt;
    &lt;link rel=&quot;stylesheet&quot; type=&quot;text/css&quot; href=&quot;css/style.css&quot;&gt;
&lt;/head&gt;
&lt;body&gt;
    &lt;h1&gt;Welcome to my PHP project&lt;/h1&gt;
    &lt;p&gt;This is a sample paragraph.&lt;/p&gt;
&lt;/body&gt;
&lt;/html&gt;