The style.css file allows you to change the look of your web pages. If you include the next line in all your web pages, they will all share the same look. This makes it easier to make new pages for your site.
This is a paragraph! Here's how you make a link: Neocities.
Here's how you can make bold and italic text.
Here's how you can add an image:
Here's how to make a list:
To learn more HTML/CSS, check out these tutorials!