hand 1: jesus let's not get into the playing JJ IP PF discussion again. most regs agree that flatting is correct at these limits because you should be able to call a 4b when 3b'ing for value IP and a 4b at these limits is QQ+.

def don't raise the flop because nothing worse continues unless they're a huge fish. even if they're a huge fish we don't have great equity against their calling range. just call and shove safe turns

hand 2: always raise pre with broadways. as played PSB the flop because it's soaking wet and we have a vulnerable hand. as played we can shove over the turn raise against most fish. we have every two pair dominated and we can expect to see a lot of top pair and top pair+draw type hands. your hand is never going to improve with a river card, right? and you're gonna call a river bet anyway, right? so we might as well get it in while our hand has its best equity/when draws are gonna be most tempted to call.

hand 3: def cbet because of the exact logic you used. i don't know about barrelling the turn because the K isn't gonna scare anything but split pairs and we have half the split pairs beat. i think just check it down for SD value. we only wanna double barrel in spots where it folds hands that were overpairs and TP's on the flop but are now split and MP's. in this case Q's are never folding and there's nothing between a Q and a K. river is either a fold or a bluff and we need reads on villain to ever consider bluffing this river because so many people call with A- and J-high.

hand 4: you're not reppin' anything on the turn but it still folds out hands against certain opponents (namely ones that PFR/call w QJo and then fold on the turn when it still hasn't hit without considering ranges). so it's opponent dependent.