[Silent A]

Hand 1: A bit adventurous calling the pot raise on the flop with just an OESD and no backdoor draws. This can be a significant leak in the long run unless you know your villain will pay you off.

Hand 2: Just fine. Pre-flop, it's never wrong to get more than half your stack (or theirs in this case) pre-flop. 10 to 25% is the range you typically want to be wary of. After flop, Aces + nut flush draw is a favourite over any hand except a set or a straight, so even if SB had a lot more left over you would usually put your stack in here.

Hand 3: Pre-flop, the call is loose. On the flop, middle set on flush boards can be a difficult hand to play profitably. You need a strong feel for your opponets because there aren't many ways for several players to like the flop without someone holding top set. Getting sandwiched on the turn is a really bad spot, so nothing wrong with the fold.

Hand 4: Standard. Don't let the straight and flush draws play cheap.

Hand 5: As kala said, pot the turn.

Hand 6: Pre-flop, probably not a good hand to pot pre-flop OOP since the Queens and fours don't connect at all. Calling the re-raise is borderline, and you're just sucked in after CO goes all-in. Not much choice on the flop when villain only has $12 left over. This hand is similar to the classic limit Hold'em problem of getting stuck between two re-raisers. Each call is probably +EV in isolation, but as a whole they're collectively -EV.