PokerStars - 3,5$ buy-in HU NL

SB: 50 BB
Hero (BB): 50 BB

SB posts 0,5 BB, Hero posts 1 BB

Pre Flop: (pot: 1,5 BB) Hero has K 7

SB calls to 1 BB, Hero checks

Flop: (2 BB, 2 players) 3 K A
Hero checks, SB BETS 1 BB, Hero raises to 4 BB, SB calls 3 BB

Turn: (10 BB, 2 players) 7
Hero bets 6 BB, SB calls 6 BB

River: (22 BB, 2 players) 5
Hero bets 13 BB, SB raises to 39 BB and is ALL IN

???

Opponent has been tight preflop and calling too much on streets so far. Not many hands played against. Am I beat most of the times? Is ABC poker folding right there? Or is it clear call because of pot odds?

Could I have been doing anything better on other streets?

Sorry for disorganised post, I am new here but ready to learn.

What is your reasoning for cr flop?

raising flop is just spewing.. can't think of a worse type of hand you could use on the flop.

Yeah it was mistake to raise flop. I pretty much thought that the villain is just trying to take down the pot with air. But yeah it was stupid from me to raise because most of the time he does have something on this flop. So my worst mistake was making the pot too big with relatively weak hand because if he plays back I am beat most of the time. Means he has Ace or King with better kicker or flushdraw but its impossible to know his hand. I called the all in on river and he got the flush with 5th card. Can you tell me which is better option in that spot: Call the all in or Fold it? I called because I had so much chips in the pot already. But I think I have to fold such situations without knowledge of my opponent.

You need to try to make your decision process part of a frame work.
So here, a flop x/r hand will almost certainly have one of the following characteristics:

Getting value - majority of the hands that will call are an equity dog to your hand

Bluffing - a good chunk of hands better than your hand will fold to your raise

Protection - depending on depth and vulnerability sometimes it will be important to protect your hand v obvious threats, ie overcards with tp on low boards.

Here your hand won't get called by much worse so it isn't strong enough to raise for value

Your hand won't make many better hands fold so you aren't bluffing - in fact you're basically isolating yourself against a range of hands that have you crushed, or are decent draws.

You are very deep - so protecting your stack is more important that protecting your hand.

Your hand isn't at all vulnerable - that isn't to say you have a lock, but most of the hands you're ahead of you will win a showdown against.
I'm not sure I can think of a single reason to x/r flop with this hand - it's like the poster child for x/c.

Why do you care? You're crushing villain's air here.

No he doesn't.

It might be a fold cause guys underbluff here, but it probably doesn't matter too much. It's really not the important point in the hand.

Would also bet bigger on the turn and river.