imo forums are better than books... mainly bc you get to look at several different ideas and you can also learn what certain types of players are thinking and really get in peoples heads. books are good but if the strategy doesn't fit your style then it doesn't do you much good.
Dan Harrington books are pretty good for strategies. You will learn a lot about pot odds and gives a lot of examples for you to follow along with for each chapter
Postflop very difficult stage of opening , especially when you have not got a pair or set, or draw ! See better video professionals with Poker Championship !