Hello Guys!

Recently revealed I fold to much against BB/SB 3bet from the BTN/CO, so it eats my profit here...

I have searched this topic, and I found a short comment from Improva:
"This is all assuming that we are IP and that villain does not call 4bets with any relevant frequency.

Against a tight range (5-6% in is those positions) I normally don't have much of a flatting range (unless the SPR allows me to flat PPs). And I never 4bet/fold. I simply just stick it in with JJ+, AK

As villain's range gets wider I flat with :
(7%) AQs, AJs, ATs, AQo, TT-88, KQs, KJs, KTs
(8%) QJs, AJo, KQo, QTs, A9s, 77
(10%) QTs, ATo, JTs, KJo,
(12%) T9s, A8s, K9s
(15%) ... you should get the idea by now

If villain 3bets a non-linear range I will start to flat A LOT more hands. One of the best ways to make that observation is to look at the hands villain flats vs our steals.

My range for 4bet/folding is normally just outside the range above: A9o, KTo, A8o, QJo

If we have additional information about say villain's 5bet range I might put AQs, AJs, TT-77 into my 4bet/call range (but that is only against very aggro players and in HU). Against players who 3bet/fold too much I will expand my 4bet/fold range."

1. Do you agree with this?

2. Is there any ultimate guide about constructing ranges? cold call, 3bet, 4bet - by and versus positions.
   I think something like the pre-flop boards.
   I know that it depends on a lot of things, but I want to avoid the biggest mistakes.

3. Do you know anything about Improva. I really like the teaching style this guy.

Thank you and Best regards: Tesla79