Hello,
There are many videos, articles, and charts available for opening range preflop. Getdotcom write a new one (take a look at his blog. Very good imo) for example. Verneer and Ryan Fees did years ago.
Is there any article that discusses about defending range preflop? how to construct calling/3bet range preflop?
I want to answer questions like this:
a TAG (VPIP/PFR : 22/18) opening from CO. He is as good as you postflop. What is your defending range? (calling range, 3 bet range, 5 bet jam range, etc). How if you think you are better player postflop?