your post flop play needs a lot of work.

Don't pot commit yourself with no reason to do so.

what's the point of the flop raise in hand 1? The pot is $6 when it gets to you and you raise it by only $3. Pump it to at least $7.

why an over the pot bet on the turn? "serving notice that we're playing for stacks/I like my hand/don't donk bet me on a draw in the future when I've raised preflop/I know you're on a draw and you've got nothing now)" doesn't do you any good. You don't want him to fold a draw. You don't want to lose all your chips if he has a made hand. On this hand as played I'd bet $10. If he flat calls a raise on the flop and check raises me substantially on the turn I'm giving him credit for a hand here... i'm just troubled by the fact he could have a lower set. Still I'd bet $10 and go from there... get some more information and invite a chase.

Hand 2 is just bad. half pot or check behind on the turn is reasonable.

Hand 3 isn't terrible. Leading out with a set is fine here. Just make a normal looking cont bet... $1.50 or something. If villain is lag he'll raise that anyway and I can escalate the pot real fast. Lets face it, you ain't getting paid unless he got an ace wants to rep it. So you might as well make it count when he does. If someone raises pre flop to me and then makes a min bet on the flop then alarm bells are ringing in my head. In villain's shoes I'd probably call with anything and raise with something strong. As played you might as well just call the flop raise and check it to him on the turn and raise it then. As played, you might as well lead the turn for something reasonable like $4.

hope this helps you.