Blinds 6$0.02/$0.05
UTG $5.40
UTG+1 $7.78
CO $5.07
D $5.35
SBHero$14.48
BB $5.87

Preflop
Hero is SB$0.07 6
KQ
UTG raises to $0.14, 3 folds, Hero calls $0.12, 1 fold

Flop
$0.33 2
K54
Hero bets $0.22, UTG calls $0.22

Turn
$0.77 2
K544
Hero bets $0.74, UTG calls $0.74

River
$2.25 2
K5446
Hero bets $0.55, UTG goes all-in $4.30, Hero folds
Hero lost $1.65
UTG wins $6.96(net +$1.56)

Why did you bet the turn and the river?

I usually fold pre. KQo does pretty badly vs UTG, and you're in the worst position (SB) where flatting with anything is often a mistake.

I don't like the flop donk. It's pretty standard to check on K54, so villain can c-bet with his air, as well as AK+.
Following up your flop donk with a pot-sized turn barrel looks horrible. What do you think is calling?

Yeah fair enough, definitely agree now looking back at things the flop donk was horrible.

Is the flat with KQo a leak or can be taken either way??

Fold preflop unless super-huge reads or something. In which case 3bet should be part of your arsenal (but used very judiciously).

UTG 57.33% 54.41% 2.92% 55+, A7s+, K9s+, QTs+, J9s+, T9s, 98s, A9o+, KQo
SB 42.67% 39.76% 2.92% KQo

You're a little over 42% against a 15% UTG range, out of position and not closing action. To call here on default is a leak.

Don't donk the flop on this board by flatting pre you are capped here pretty much and def vs. an UTG range who has a range advantage on this board.

Basically you are letting villain play perfectly against your range, you can't have any overpairs or TPTK and you are giving free information away and v will likely fold everything that you beat and continue with better.

Don't flat KQo here esp vs. an EP open, just fold pre i might flat KQs vs. a weaker opp. tho.

Wrong play on every single street

Fold pre, don't donk the flop. This is a good board for the PFR and KQ is one of your strongest hands in your range but not strong enough to get all in.

Let him put money in the middle with his weak as he is very likely to cbet. Donking makes him fold his bluffs and call with stronger parts of his range.

Your equity against a range of 6% of hands (maybe a bit tight for UTG 6 table, not sure) is about 33%, which means you aren't getting the odds to call and you're out of position. If your opponent is looser you might be able to call profitably, but there's also the risk of the BB doing something.

Don't donk the flop, he's going to bet most of the time and if you donk he will fold his air which he would have likely otherwise bet with.

There's really no reason to bet pot size at all. Better hands will never fold (AK MIGHT fold thinking you have a 4 but it's hard to fold 2 pairs with top kicker). If you want worse hands to call, overbetting doesn't accomplish this. Worse kings may call a smaller bet here, but not PSB.

After he calls a PSB on the turn, why would you fire a third barrel? He unlikely called the turn with a worse king, and those are the only hands you have beat. There's no way he's going to be folding a better hand against a 1/5~ pot sized bet on the river. There's no way he was going for a draw which he missed if he called a PSB on the turn, either.