Thread:Ursuul/@comment-35476126-20190922002457/@comment-28083312-20190922140359

https://www.w3schools.com is still a great place to look up individual properties even if you’re advanced, & https://css-tricks.com has guides on the more cutting edge modules such as flexbox and grid, the former of which is a valuable asset when you’re working with Portable Infoboxes. Mostly however you learn via experience, by writing a theme or themes, figuring out how things work, and for that PortableCSSPad is your best tool on Fandom. EDIT: Fandom also has a nice Town Hall on CSS here, about two hours long.