Story info please?

I've been a longtime Harry Potter fan, and I got Wizards Unite when it first came out. I played for a bit but had to stop because my phone couldn't run it. Multiple device switches later, I'm back in the game, but I've apparently missed a number of major story developments (Adversaries, The Unforgivable, etc.). I haven't been able to find this information anywhere - could anyone catch me up on the story so far? Thank you!