HTML is the foundation for the Internet. Most websites are written in HTML format and it is the format that is read by most search engines. So if you want to optimize your website for search, you need at least a basic knowledge of HTML. This knowledge of HTML can help you optimize the structure and layout of your website. Many content management systems (CMS), such as WordPress, have made it easy for users to add their own HTML to the website. For example, you can freely edit the following items on your website without having to go into the original HTML document: Internal links, External links, Metadata, Alt tags, Title tags, Headings (H1, H2, H3, etc.), Nofollow