Resources for World Gen

I am starting to get into world gen, and it's very intimidating. What are some resources that some of you may use for specifically world gen? things that would help: tips, world downloads, websites, videos or channels, etc. I asked this in a wrong channel earlier. between then and me reposting in this channel I thought to expand the question to custom entity creation with data packs. I know they are updating things with variants in the newest snapshots. I am also starting to learn some python before learning beet and bolt, tho I have them installed I don’t know how to really use them.