PokerTracker

Is there already on overview for the exact definitions of some of the stats?

For example the 2bet...is it only a raise first in or does it also count isolation raises...so lets say "3bet vs BTN 3bet"...does it counts both...the times where button was on a pure steal but also isolating MP or CO which were limping?

Is the fold to 3bet now the "pure" fold to 3bet....like only the times the player raised and got 3bet and folded..and not like with PT3 where it was counting even the times the SB folded after button was 3betting MP as a fold to 3bet for the SB?

Until we get the full documentation written up you can see exactly how any stat is defined by using the PT4 menu Configure > Statistics. The "Details" tab has a full description of how the stats are calculated, and what situations they cover. You can also see the exact expressions used by looking at the Definition tab, and then the Columns tab to see how each column is defined, should you wish to go that deep.

Unless it specifies that it is an open-raise then a preflop 2Bet can any "first raise", regardless of previous limpers.

We also have built-in stats like "3Bet LP Steal", which will not count times there were limpers. You can display this by position in the HUD if you like, by setting the Position property of the stat, so you could see the percentage of times a player 3bet against a steal from the button or cutoff (LP) when they are in the BB (for example).

"Fold to 3Bet" is the percentage of times that the player folded to any 3Bet, regardless of previous action.
If you want to count only times that the player was the original raiser you want "Fold to 3Bet After Raise" - both are built in, and with versions for each street.