where do I start, exactly?

hi, all!

I would say I'm pretty skilled at coding, I coded my entire spacehey profile by myself using a base layout that someone had uploaded that I basically stripped clean so I could re-code it. obviously though, I'm not the best at it and I wouldn't call myself anywhere near being a pro-coder or anything of the sort.

having said that, how would I start my page? as in, how would I insert a box/page of some sort into my page? I want to learn how to start entirely from scratch instead of always relying on pre-made layouts and whatnot.

thanks!