Hi!! i'm self taught, and i learned most of it from W3Schools and different coding-related forums!! i really recommend W3Schools to learn the very basics of both html & CSS, toyhouse's CSS is not very different from what's it's usually taught on that site, but it has a lot of elements that do require customization one by one... so TH CSSs may be quite long!!

I do truly recommend first learning HTML before going for the big final boss (which is CSS), as HTML is easier to understand! some tips i'd give for it is to absolutely experiment and frankenstein with already pre-existing codes to start learning and knowing how it works (as long as it's kept private and the coder allows it, of course!)

as i said before, i don't think there's a very BIG difference, other than the fact that since it's an already pre-made site, you gotta take into account that not every html or CSS element might work on it! so that's why i recommend frankensteining premade codes and studying them, so you know what works on TH and what not!