66 on low board, want protection, how are you thinking about it?

This is a spot on the turn you most likely beat only beat a flush draw and it depends what kind of villain you dealing with if I bet for thin value and protection. The river is a standard check for sure.

Cheers,
SDK1987

The BB defended and the flop came really favorable for him.
Your flop bet is good because you have mid-pair and you make him pay a flushdraw/straight-draw. Besides, you have two cards that connect with that board, one of them a heart. Your bet could have won the pot immediately. That didn't happen, so he probably has some sort of hand in this board. Two overcards are a possible hand. Some sort of AsXs hand could also be taken into consideration.

The turn card is a card that creates a straight-draw situation if he has an ace. Once he checked again, I'd be looking to check-behind here. In addition to the possible flushdraw you were already facing in the flop, you could now be facing a straight-draw. Your opponent could have a hand with a lot of outs (more than 10), which eliminates the fold equity you could have by throwing-in a second barrel.
In short, here I'd stick to the "small hand, small pot" principle.

The river card is a K, which doesn't favor you at all. Since he called your turn bet, checking here is the best option, in the hope that your pair of 66 will be good at the showdown.

I would bet OTT for sure, smaller sizing though - thin value bet, since we still beat draws which will call, but also lose to few combos already which might plays x/c OTF (77, 88, 9x). By betting the turn we also ensure a x/x OTR.

If he leads OTR, I calling depending on the sizing.

Want protection? Try Expecto Patronum.

Your opponent could have a hand with a lot of outs (more than 10), which eliminates the fold equity

It doesn't matter I think. If he calls, he will calls with wrong pot odds.. (I fold to donk bet OTR)