Nice! Welcome and congratulations on making the move!
Outside of avoiding the three tankie instances (.ml, lemmygrad, Hexbear), you don't need to worry too much about which instances a community is on. Just search for the most active ones (there's a community search at the top of the page) and hop in!
The tankies are concentrated on three main instances so basically you can either block those completely or just don’t participate in any communities on them. Some do visit the non-politics coms there but I think they always end up interpreting things in a political lens so I avoid them all.
Actually a lot of the more debate-bro tankies tend to make alts elsewhere to argue. By blocking the big three (if they're federate), you're usually just avoiding the ones who are not very argumentative and of course all the campist-flavored topics which might be annoying.
May I ask what those instances are? I’m assuming .ml is Marxist Leninism (mask off) but idk what hexbear is. Are there any instances which are specific to my interests such as anime and music?
lemmy.ml is one of the original instances, run by Lemmy developers Dessalines and crew. ML for them stands for "Marxism-Leninism", not "Mali." They have a reputation for censoring criticism of Russia and China, but have a number of mainstream-ish communities.
hexbear recently lost the Hexbear.net domain name due to a registration screwup. Last I heard they are hosted at chapo.chat. They have a reputation for "dunking" on non-tankies.
lemmygrad.ml I know the least about, as I've been defederated for nearly my whole Lemmy lifetime. Allegedly pretty tankies.
ani.social seems like it may specialise in anime stuff. I blocked several of their communities in grounds of not labelling nsfw. That's about as much as I know.
Hexbear was worse, very pro China/Russia/North Korea, but I think they didn't renew their domain license, so the server went down. Lemmygrad is the same way, I think it's still active. .ml I didn't think is too bad, just block yogthos or whether their name is.