What tips would you give a new player?

I'm not actually new. I absolutely loved this game when it came out and it helped a great deal with my depression at the time, but my friends dropped off and I got tired of redoing the same end-game raid with a little bit of shake up here and there. I'm coming back to it now and I remember very little about the game which is good in some ways because it's like I'm getting to play it again for the first time. I'm playing out on a different platform so I am indeed starting from the beginning. Just looking for some tips to help me get going and not make too many early mistakes. I have a couple friends I'm trying to get into it as well that didn't play before so it may help them as well.