Hand 1: I think as played and given the size of the bet you need to call the river.

Hand 2: when you call this preflop you can't just fold when you have an overpair. However, given your history with the player and your reads of how aggressive he is preflop I think I would prefer either a fold or shove with JJ.

Hand 3: I think this might be a fold... you saying that he is a weak player he probably isn't doing this with the only possible draw (JT, QJ, QT) or bottom / top pair. In theory he shouldn't have that many kings with a worse kicker then you either.

Hand 4: shoving the flop is fine. You can also call, but being out of position it makes things a little tougher. Shoving depends on if you think he is the type of player that will fold a hand like QQ or A9 this deep on this flop or not.

Hand 1: the limp on the button could be 10-9, 9-7, 9-8, 9-J so I'm putting connectors and gap connectors in his range. Besides sets beng hard to get im guessing any pair on the button is opening with a raise. His flat call on the turn might cancel out a two pair. The river bet seems a little light, I'd call here with top pair top kicker even though there is a one card straight.

Hand 2: would call the bet hoping his semi bluffing with ak aq.

Hand 3: weak players can also describe visual players so top pair is probably in play at minimum it does smell like a two pair for it played out like a set as well. Only possible draws are gut shots, I think I'm folding here.

Hand 4: you hand but flush draw and possible two live overcards in play. In which case your favourite even if only the ace is live you have 12 outs. Which such a big raise preflop I'm guessing he has Broadway pairs maybe even pocket 10s. On a board with no connectors, straights or flushes you can play ur nut flush aggressive because if it comes on the turn u are probably not going to get paid off. A check raise is also a play but getting ur money in wit this board is a good play too.

How did your hands play out?

First of all you need to give more information of the players and how they play. Usually it's impossible to answer to hands questions without them. Poker is more about the players, less about the cards. Especially the question 2 is totally about how the all in player plays.

otherwise i would go like this : Q1: easy call, could be bluff or betting easily worse for value
Q2: no idea, depending of opponent, to really tight players you should have folded preflop.
Q3: again about the player, and you should have folded preflop anyways. But would call if no reads, because good hands should generally just call flop.
Q4: Usually overbets when a flushdrw is on the board is a flushdrw with overs, so i put him on KQs QTs T8s and such so would do the same line as you.

Hopefully this helps.

q4: could offcourse have set if he is a scared-easily player who scares that the flush will come, so get some reads on the players.