None of this is needed to play. It is for after a few nights, when you know what you are doing and want to start doing it well.
Everything on the main page is what you need to sit down and enjoy yourself. This section is the next layer: where you are sitting, when a draw is worth chasing, and which hands to play in the first place. Each one has a practice drill, because none of it sticks from reading.
Knowing this material will not make you win on the night — poker is far too luck-driven over one evening for that. It makes you win over a lot of nights. Anyone who tells you a strategy guarantees a result on a given Tuesday is selling something.