This was a Kindle book.
Very inexpensive ($3?) Also very light on number of pages.
Having gotten rid of my collection of two dozen or so books on Hold'em strategy and tournament play years ago, I returned a little curious after brushing up on software such as Pokerstove, Equilab. The latest rage is to "put" your opponent on a "range" and the idea is that tons of observation lets you update the conditional probabilities to better infer his starting/raising etc. ranges. In practice this is only one aspect of the game.
Obviously how well a hand connects with a flop or how a "range" connects with a flop is key in re-assessing one's chances.
A practical and a theoretical player can ill afford to make poor decisions post-flop.
I dont know if InstaPoker Coach (the app for which this teaser of a short book is a ad) does a great job or not.I can say it does go in the right direction.
You will separately want to hone your "recognition of flops" as dry or wet, until you overlook no small clue (as a beginner surely will, and as I am prone to from time to time)