KQo river second pair

AQ and some missed flush draws?
I would rather say he has sets, 2 pair, straight and those missed flush draws. If we start counting combos I would say you are behind most of the times, depending of course how many missed flushes he will shove there and how many not top 2 pair he will shove. To call this bet you have to win 35-40%. So just put him on a range and you will have your answer

It's safe to fold ott if faced with mini raise

The villain seems not to be mad, I would definitely fold OTR, maybe even OTT, but I think I´d give it a call there. Even though the king comes OTR, he pushes. Would he do this with Qx? I also don´t think ppl bluffs like that (at NL5). This leaves us only one option and that´s fold. Villain´s line is the strong one and we have 2 pairs, which are good, but 2 pairs are not that good as they seem and inexperienced player should treat them carefuly imo. Trust me, I´ve been through it myself ♦. I overestimated two pairs and called on the rivers and lost a lot of money.

In such spots, i've adopted a strategy that seems to be working very good for me.

Minraise the turn - fold if he ships and check behind river if he calls. If blank comes on the river and villian jams first - i call. If the draw gets completed and he jams - fold.

The thing is that people at Nl5 would not ship draws on the turn when you raise them - they will ship only made hands.

This way you would not be in a position to blind guess what to do on the river.

Not saying this is a good play but i crushed Nl2 and Nl5 with that play.