[mattkrea]

You'll be fine with either. Just pick a camera you can afford and focus on quality glass (lenses). I personally prefer the Canon system so my recommendation would either be a T7i (DSLR) or, if you can afford the upgrade, the EOS R (Mirrorless and my current primary).

Biggest con these days on mirrorless is they tend to run through a battery charge about twice as fast as a DSLR equivalent.

For materials.. as much as I've not been fond of youtube in the past for whatever reason I find it extremely valuable today. Peter McKinnon is pretty great or if you want to start with landscapes maybe check out Thomas Heaton.