ekeivs

I was struggling with my winnings when I started as well. I think best for start is just play more hands in position and defend blinds with hands that is easy to play out of position like paired, A high flush etc. Also stop cbet bluff at beginning. Just bet when you think you have the best hand and fold when you don't. Also forget about bluffing and sometimes go to check call mode when you are out of position with hands like overpaid or 2pair hands.

It's depends on villain opening range and your position.
If villain opening so wide like 33+,A4s+,A7o+,KTs+ or more you should shove on BTN.
But most of the times villain are not going to open so wide if short stacks are behind.
So just muck your hand and move on to the better spot.

It's depends on villain on button shoving range.
I don't expect that villain from MP ever call off unless he is trapping.
Because of that if you think the villain on BTN shoving wider that 33+,A4s+,A8o+,KJs+ then you should re shove but if villain shoving range is tighter than this you can muck your hand and wait for better spot.

Can someone give me some advice where I could learn more about SPR?

Reason why I didn't 4bet preflop was because effective stack was about 140bb.
I think if I 4bet then villain can play against my 4betting range perfectly.

I think Harrington is out of date.. I would recommended Jonathan Little books.

Against villain like his I wouldn't give him much credit for full house after he checks turn.
And you have flash - easy value bet. You might bet something like 1/5 or 1/10 of pot that would induce from him bluff because his range is very polarised and he can't win pot without bluffing.

How it's played fold looks the best decision also I would bet river much smaller let's say something like 0.8 or 1$ to let villain call with worse like Kx or Tx but if he raises snap fold and save some money

I prefer calling better than raising in BB and c/c flop c/f turn if doesn't improve or if villain checks the turn bet the river.

I also have similar problem. Just check my loses against 3bet and it's big part where my money burning. In general I losing when OOP.

I just start to try some HM2 filters and find out that main CO and BT showdown winnings is hugely profitable but from MP and EP I losing money and showdown winnings are so negative.

Thanks guys. Going to check out Shuller videos. By the way what is your preflop stats for PLO?
My VPIP is 56.8 PFR 25.9 and 3BET 4.98 in six max ZOOM