Some wars can’t be won. It can be hard to come to terms with this fact when you’re still on the battlefield, but if somehow you manage to step out for a moment, then the truth will become obvious. You have lost, the people on your side have lost, the villains have won and, if anything, you should have run away a long time ago.
Literally the only thing to understand before using it is the multiple instances, which doesn’t take a PhD. (Even better, you can safely use it even without knowing about instances.)
If people don’t want to move to Mastodon because it’s “too complicated”, they’re not actually looking for an alternative.