The Troop choices are the backbone of the Tau army. You need troop units to capture objectives. The Tau Codex only offers two options when it comes to Troop choices, the Tau Fire Warriors, and the Kroot Carnivore Squad.
Tau Fire Warrior Team Tactics
Fire Warriors are good value for their points cost. For 9 points per warrior you get the a 4+ save and the 30″ S5 basic weapon mentioned earlier. If you compare this to the 10 points per model that the Imperial Guard infantry man costs you can see my point.
The weak spot with the Tau Fire Warrior is when it comes to close combat. With stats of WS2 and I2, you can see that the Tau will fall like flies. So the core stratagem you will need to employ will be to shoot the enemy down before they get in to assault range.