Hi all. I try to find answer couple day for my questions and can't...
Whan i must flat call in 3 bet pots... for example
EP open Mp 3 bet we on LP I'm usually flat call in this situation all my 3 bet calling range as If I was pref opener & get 3 bet after me. So I calling hands like 76s T9s K10s J10s any AXs and other... And now I start thinking what this is serious leak and in this situation I must flat hands that I will 4 bet and couple more ... let's say AA-TT & AKs...

~ 100bb stacksize MTT

Mhh, I am not really sure but it looks like that your calling range is a bit loose.
Its player/situation dependent, I would say, but there is the danger of the open raiser 4betting/jamming and then you already invested a lot of your chips.
And then in multiway pots the SPR gets quickly significantly lower.
It should be slighlty different if you close the action after an open raise and calling.

So I would readjust my range here very dependent on the type of player who is EP.

If you haven't already, then i suggest you sign up at Gtowizard.. they offer a free solve each day.. Enter various spots and take a look at the ranges they suggest. I made a spreadsheet and have tabs for EP,MP,CO etc etc and have screen shots for various scenarios... I like to cross reference my ranges with those that Gtowizard suggest and adjust accordingly...

Seriously though.. Gtowizard is the nuts and well worth the cost of the sub

This guy is clearly a complete beginner and you are trying to sell him a self-directed gto-based training product. This is not good advice.

OP, you should basically never be coldcalling 3bets as a standard unless you have some very special reason to do so. Playing 4b/f is a simpler and theoretically stronger approach. When it gets raised and 3b in front of you, you should just be folding most of your suited connector and medium strength pocket pair type hands.

The 3bettor is already representing a reasonably strong range, the opener is completely uncapped (could still have very strong hands like QQ+, AK), and we are just gonna take a weak range to the flop. You suggested flatting some strong hands as a way to counteract this, but generally speaking your strongest hands like QQ+ want to 4b themselves and build bigger pots.

The one thing about gtowizard I would actually recommend - they have pretty good preflop ranges for cash and mtts at different depths that are completely free. Look at what the ranges are for the players behind an opener and 3bettor, even on the button - you will see very little if any coldcalling, ever.

Sending the guy down a rabbit hole wasn't my intention. I was trying to suggest that he/she takes a look at the solved pre flop ranges and go from there. Looking at charts to build a solid pre flop range and foundation to work on can't be a bad thing.

Other suggestions i have would be to look at the free content on Youtube - plenty of decent players post decent strat videos.

GL