Newbie learning the ropes of the endgame! Help? :P

Hey guys,

I've been playing the game for a little over 3 weeks now (retired from D3 a couple months ago), and just got to the end game mapping phase. 3rd character finally gave me what I want. I still don't know what I'm doing wrong/right. Feel free to pop in and say hello! Give a few tips. I'll regularly be streaming PoE until further notice! Tonight, I will be live in 15ish minutes. Plan on going for at least 2-3 hours. Hope to see some of you there!

https://twitch.tv/jcplays_live