From the introduction:

In this illustrated, step-by-step tutorial, you'll create a simple adversarial mission (team vs. team) using the F3 mission development framework for ArmA 3.

You'll use many components from F3, but by no means all of them. The tutorial will explain how to configure those components that require input from the mission maker. The tutorial will also explain the components that are automatically enabled simply by using F3 to make the mission.

When you finish this tutorial you'll have a mission that's ready to play on either your locally-hosted server, or uploaded to your community's dedicated server. To help you check that you've correctly followed each step, a downloadable copy of the tutorial mission folder is linked at the end.