I would recommend taking a look at the Googles HTML/CSS Style Guide to familiarize yourself with best practices of writing HTML and CSS. Style guides are written by a community of developers and you should look for them for any language you pick up to ensure you are writing quality code.
I would recommend taking a look at the Googles HTML/CSS Style Guide to familiarize yourself with best practices of writing HTML and CSS. Style guides are written by a community of developers and you should look for them for any language you pick up to ensure you are writing quality code.