I am at the button at a 6 table, microstakes nl cash game. I have AcKc. UG raises 3 bb and everyone folds. I decide not to raise and play along. The UG is a bit loose aggressive kind so I thought I would use that. The flop comes Tc Qh Js. He takes a long time and checks. I usually go 3/4th pot as soon as I hit top pair to stop the villain from hitting their draws. However, this time I too check. Turn comes 4s. He checks. I should have probably checked here but I made a small 1/2 pot bet and he folded immediately. This is one area in which I need help. I am so afraid of people making their draws that I don't play slow even when I have like two big pairs on the flop. Please advise. I need to make more value for my big hands.

I don't think you did anything wrong here. If he's check folding you were probably never getting anything out of this hand. Even if villain hits a card on the river it'll probably not give them anything that they're going to call or bet big with. They might have bluffed the river but then again maybe not.

On a turn like this there are a lot of hands (draws, pairs, low two pairs) that villain could have that would happily call but might prefer to check if they can. Betting will get more value out of these hands than slow playing in my opinion. I'd probably bet big on this turn, about third pot, to get value from these hands and just accept that villain is folding a lot of the time. The fact that you didn't three bet also means villain might discount you holding AK making it more likely they'd call.

There's really not a method that works 100% of the time to extract value in these situations.
The tricky thing about poker is not to always have the best possible hand (nuts) but to have a better hand, even if ever so slightly.
If you have the nuts but your opponent has air, he probably won't pay you off. Things change when you have a full house and your opponent has the nut flush for example he has a strong hand, but you have a better hand, that's when you can extract value.

On your hand, I would have checked the 4 on the turn, as it doesn't improve your opponent's range, you're still way ahead as the board isn't paired, so your straight is still the effective nuts. You said he was loose and aggresive, so I would have given him the chance to bluff. Maybe you could have gone for a smaller bet (1/3 or 1/4) if you were concerned about he backdoor flush draw, but I think he would've folded too to your delayed c-bet.
He really can't have much when he checked the flop as an aggresive player, what could he have that would give you trouble at the turn? 2 spades right? but it can't be A, K, Q, J, 10, 9, 8 of spades as those would've gave him a straight/gutshot draw or a pair, and he would've bet something at this point. So even if he had 2 spaces, those would've been low spades and he might not feel confident about a low flush (if the river hits). He might have a small pocket pair that missed the flop, low suited connectors is the other option, and that's pretty much it I think...

Originally Posted by rhinoji

I am at the button at a 6 table, microstakes nl cash game. I have AcKc. UG raises 3 bb and everyone folds. I decide not to raise and play along. The UG is a bit loose aggressive kind so I thought I would use that. The flop comes Tc Qh Js. He takes a long time and checks. I usually go 3/4th pot as soon as I hit top pair to stop the villain from hitting their draws. However, this time I too check. Turn comes 4s. He checks. I should have probably checked here but I made a small 1/2 pot bet and he folded immediately. This is one area in which I need help. I am so afraid of people making their draws that I don't play slow even when I have like two big pairs on the flop. Please advise. I need to make more value for my big hands.

You bet small and allow them a bit of rope to hang themselves, you can slow play too, but Q 10 J not a good board, as they could have QJ, JQ, Q10, AQ, 10's, J's, Q's, 89, KQ and maybe even a few weaker hands than that.

Those are all hands they are likely to have if they are playing tighter that will potentially raise, or call you.