4v4 Small Sided Game - Defensive principles of play

The importance is on the initial setup and the first four passes of each game.
The game should not start without the opposition being ready, so that the defensive shape of the team without the ball can be correctly worked on.
Pressure, cover, balance.
This SSG is relevant to 3v3, 4v4, 5v5, 6v6, 7v7, 8v8, 9v9, 10v10 and 11v11.
These principles of play are the same as they've ever been and will always be relevant to teaching the fundamentals of football.