Hello r/starcraft!

I've recently been getting back into SC2 (stopped playing after campaign) and was wondering a few easy ways to get back into multiplayer. If anyone could provide some simple tech tree and unit counter charts for me, stock build orders, or even how to counter stupid crap like 6-pooling.

Any help is much appreciated, I hope to be getting out of bronze league soon... lost all but one of my placement matches and won 1 bronze league game (opponent was afk) :(