I'm getting back into this game after I stopped playing a few years ago. I was pretty casual (Rank 59), but I want to learn more about the game mechanics and stuff. My big problem right now is that there's tons of info, but it's scattered in a million places and a lot of it is 3+ years old.

I remember there was a toolbox and calculator, but my link for it looks out of date. What are some up-to-date resources on game mechanics and strats? Other than Epic Quests, are there catch-up mechanics I should be aware of?