Yeah, there’s ALOT to learn in this space and the various projects and applications.
Ethereum is a BIG one, because it was the next leap after Bitcoin, that essentially started the whole premise of decentralized applications and smart contracts. Many of the new projects coming out are building upon the conceptual frameworks Ethereum set into motion - so most of what there is to learn about it translates over into the rest of the space perfectly. And, there are SO many developments on it that’ll broaden your horizons as to what types of possibilities exist in the space.
I’d also HIGHLY recommending reading Don & Alex Tapscott’s definitive book, Blockchain Revolution as it covers tons of these angles.
And no doubt, there’d be many of us here quite happy if Steem continues to rise... :-)