dude, go to bed

https://www.twitch.tv/nickhowardpoker/v/100042724
Somewhere around minute 25 in next ten minutes there is nice overview of GTO as such.

Haha, brain explode!

But let's make it simple:

There is no "GTO" in game theory jargon (among those who research it), that's a phrase coined by poker players. In game theory we have Nash equilibria. If you play one, you are always exploiting your opponent to the max. That's what you want to always do. "GTO" is just the name poker players (for whatever reason) has chosen to call the strategy you end up with when your opponent is giving you the same treatment.

Since nobody is treating us that way, we can ditch the whole "GTO" thing, since it's just a special case of playing max exploitatively, and a case that we will never encounter in poker, since nobody will be max exploiting us. We can study it a bit to map out the lay of the land and get some overview of what is sound to do (for new players, to see how much aggression you can get away with is very instructive), but we can't make a playable game plan out of it.

You want to exploit people, and playing the Nash equilibrium against whatever (mostly static) things they are doing is the most brutally effective way to do that. But how? You need to find a way to do that in a simple way. Nick has a lot to say about that part. But it mainly revolves around recognising that players mostly are not adapting to your exploits.

So you are free to view the process as finding a rough approximation to a Nash equilibrium where your opponent's strategy is static. In which case you are allowed to do peculiar and extreme things that are robbing your opponent without repercussions (minraise button 100% vs tight-passive blinds that 3-bet way too little and defend < 50% combined would be a simple example of that). And where your strategies become very pure and hands are not mixed a lot between various options. Then you get to the dream scenario of having a strategy that is both extremely profitable and easy to execute.

The hilarious +$200k 15 bb/100 graph of one of Nick's students with a straight-up redline and a losing blueline is probably the best illustration of what can happen if you push exploitation to the extreme.

Ill try with very simple wording , seems it is very confusing to many because words are soooo complex :-)

You try to exploit opponent to max, and he finds answer how to stop you and exploit you back. Then you plug your leak and try something new again, he plugs his leak and attack your leak. Every exploitative line as such is opening you for counter exploitation.

Back and forth, at some point, two perfect opponents reach stage of perfect equilibrium, when they play all their hands in maximally profitable way that is not opening them for counter exploitation. In this scenario, opponent will stay in this state of equilibrium's , because if he deviates and try to exploit you, he himself would be open for counter exploitation.
All this is domain of theory.

In practise, opponents are rather static and have many leaks, and are rather far away from Nash equilibrium. In that sense, if you used equilibria that is perfect strategy against perfect opponent, you wouldn't gain maximum value out of opponent who is so imperfect!!!!

Using tools that are finding GTO equilibriums , will enable you to maximally exploit opponent when you lock him to NOT adjusting ( because he is human :-) , and in that sense GTO world is used to find maximally exploitative strategies and lines against human players :D IF that makes sense.