It didn't really get more complex. There's only one Bitcoin network and a few soon-to-be-dead shitcoins that call themselves Bitcoin. One of them is run by a scammer who claims to be Satoshi Nakamoto. There's also a lot of altcoin networks, but those existed 10 years ago. Altcoins try to invent new things to attract investors, but they never actually deliver anything, so it's just a bubble cycle of empty promises.

Be careful not to get lured into some of those altcoin scams while you're catching up with your crypto knowledge. You will see a lot of false information claiming how great they are, but try to look at what they actually do and their track records.