The dual wielder feat allows me to use one-handed weapons for two-weapon fighting. The polearm master allows me to use my reaction when someone enters my reach.
If I would be fighting with a longsword on one Hand and a quarterstaff in the other I'd have all of the following options for attacks:
- Longsword attack action, quarterstaff bonus action
- Quarterstaff attack action, longsword bonus action
- Quarterstaff attack action, quarterstaff bonus action with 1d4 as damage die
And I would get to use my reaction to attack with the quarterstaff when someone enters my reach.
Is all that correct?
I ask this question to better understand how the fighting styles and the feats in D&D 5e work. I am quite sure that it would be sub-par to really combine those two feats.