You have the option in this box to to decide at what level your team will start out as. Because we want them to guard the Oil Derrick and add some difficulty to the map, we will select 3 and make them elite. In single-player maps this is where you decide WHO gets the team, whether it be the computer or the player. I normally place the priority at 5 and the max at 1 and it works flawlessly. But after you get comfortable with triggers and teams, experiment and let the community in on your findings.
Nothing is written in stone.
The tech level box is self explanatory, what tech level is allowed in the map, etc. The group box is normally left at -1. I have never seen anything else in this box, and that includes all of Westwood's missions. This box is asking where the Team will be created. Leave the tag box empty for now, we will get back to that.