Socialism

Are you asking for a beginner course on socialist theory? or for pointers on putting socialism into practice?

There are repositories for both things, but I always point people to reading (or listening to) The Communist Manifesto first. It's not an overly difficult read for most people, but listening to it in full takes about an hour and a half. If time is an issue, you can watch a summary like this one. In my opinion, you must read TCM and get a strong foundation before you start to read or discuss other socialist theorists, as all notable socialist theorists use Marxism as a basis - unless they're non-Marxist.

Lemmygrad is the overtly communist instance of Lemmy, we have some resources, and our theory communities are always willing to explain the basics.

Gravel Institute has some decent stuff on youtube, if that's your thing.

But on putting socialism into practice, figure out which parties are the most active in your area, and see how they try to interact with their communities. The best way to apply socialism will change place to place, so it's best to just join a party and go from there.