Next opening

Some of the advantages of 4.b4 are to:
Deflect the bishop from c5
To gain time, development, and space by chasing the bishop around
to open up lines for attack. We will see some demonstrations of this soon.

I think to best way to learn is by doing. Can we set up games on this site to practice with others in the group any particular opening before moving on to new openings?
Also, if using one of these openings with an anonymous opponent, why woulod they counter with their opening as expected from these examples?
Even though it's a little early, anyone have ideas on the next opening??