CSS, or Cascading Style Sheets, defines the look and formatting of that HTML. Both are essential to coding your own website, and here's how to get acquainted with them.

For more coding advice, take a look at Learn how to code in Java on a Mac and How to learn Python coding on a Mac. And we’ve also got a roundup of the best web design software for Mac.

1. HTML Coding Standards And SEO Go Together An SEO familiar with HTML understands how a web document should be structured and is alert to the consequences of poor coding practices.