The latest option revealed is to play against one, single player and try different heroes.

I could describe everything here, but let’s start with a video that will definitely answer most of your questions:

As you see, Duel Mode allows 1 vs 1 matches, where each player chooses three heroes. The first one to die three times is the one to lose. As a reminder, you can test Quake Champions in the currently ongoing Large Scale Test Tech, as this closed beta (with the beta keys not being that closed at all) is called.