I liked "The food chain theory" in Insider secrets of online poker by Theo Cage and harrington is pure essential for sure. There are sooo many books, and most of them are more or less the same, but Videos are as well, aren't they?
The difference is in books it is easier to include additional information and thoughts, diagrams and charts. If, on the other hand, anyone has a nice collection of HELPFUL videos (more coaching than spectacular
hands) I would be glad to see it being shared here.
But on youtube for example you will sooner or later see video no147 of Phil Hellmuth tilting or badbeats or the magical reading skills of Daniel.