There is no overtaking during qualifying, it's a 20 minute session so you have ample time to find space for a lap. If the driver ahead clearly moves off line and slows to let you through this is acceptable, but battling on track is not and should be reported.
RTG is allowed in Q, you must be off the racing line at least but preferably off the track before RTG'ing.
Use of in game chat is prohibited in the Q session, teams will win themselves time penalties for each individual breach.
In the very unlikely event it is a wet Q session, you must have your rain lights on.
Don't verbally abuse each other in the Discord channels, discussion of incidents is fine but devolving into arguments doesn't get you anywhere and will win all parties penalties.