Looks like many of the tournaments are KO now, .. took some time off.. where is best place to get training?
Dara O'Kearney's book is very good (actually all of his books are really good).
PKO's are definitely the most popular format these days... it's also where all of the weakest players are.
I knew that ranges were much wider in these due to the bounties but I didn't know how much I actually needed to adjust my ranges. There's now actually some specific formulas you can use, where you calculate a number based on the # of starting stacks & the size of the bounty. (Dara refers to this as the 'Bounty Factor') and then with this you can plug it into a formula and then you'll know if your calls are +ev. Deeper in the tourney, you're also adding in ICM.
I haven't spent enough time on it but am planning on it (I have the book). Typically marking
hands I want to review, and then making calculations while reviewing/studying to see how far off I am on my calling ranges (& shoving/raising, etc.).
Some of the other guys out there have formulas for calculating for PKO's (ie. RYE Bencb). It's the same thing. Dara's is easy to follow.
He's also got a good book on GTO called 'GTO Poker Simplified' It's a good book but not all that 'simple' imo.