I assume you mean the code for making a profile (AKA CSS). In that case, I think there’s some good top threads on this very forum topic that you can look through; there’s even a thread with CSS tutorial links.
If you genuinely mean HTML, though, I’ve heard W3Schools is a good site for that :0 it’s a pretty simple language (...I think...I learned a bit of it for a comp sci class when I was 16 if that means anything).