@kennie_fluffball there’s a lot to read in the forums, probably the Player Guides and Gameplay & Tactics sections are particularly useful.
I would add this to your reading list for sure, maybe even the place to start: Advice for New Players, or "All the things I wish someone had told me when I first started."
Also recommended reading: What exactly is a Gacha? (Read before posting things about "unfair pulls")
Best of luck!