You must be agressive with good cards, and just fold the bad hands...
But always keep how many big blinds you have it in your mind, because that will help u, if we have more than 20 big blinds we can min raise, or raise for 2.5bbs, if we have 15 blinds or less we can shove directly....
Easy example, we have Aces in utg, we have 10 big blinds
Correct move: ALL IN!
We haves aces utg, but we have 30 big blinds:
Correct move: raise for between 2 to 2.5 big blinds... If you shove they will know your hand because of your position utg we only play good hands, by the number of your blinds. Shoving utg with 30 blinds represents a lot of strenght