An overall comment: fold more than you raise more than you call....

Hand 1 I fold to the flop 3-bet. Definitely fold the turn

Hand 2. Pre-flop and flop are fine. Bet the turn! Let them prove they have a hand, scare them into thinking you have a flush, etc. You checking suggests that you are scared of the ace, if i was villain holding ATen i raise here, repping the flush and thinking I still probably have the best hand.
As played you are in a nasty position, note that UTG is raising less than half pot, I would consider checkraising all-in, but probably fold.

Hand 3: you have a very good hand. Maybe you are way, way ahead. SB bets out here with most holdings, I re-raise to try and find out where I stand. Just calling here is way too passive, raise or fold.

Hand 4. It's nice to get lucky sometimes. You got lucky. You put villain on trips. That means that 8s is not an out, nor is xs where x is villain's other hole card. How many outs does that leave? 33 and 88 also play this line, then you are drawing dead. I would consider checking the turn, hoping to see a cheap river. As played I fold.