Ground and neutral bus considerations when wiring a gfci breaker
Yep, you got it right.  Main panels (not sub-panels) always have the ground and neutral bonded (connected). I prefer to put neutrals on the bus bar that can be isolated and is connected to the neutral conductor.   The reasons for this is neutrals carry as much current as the hots and should have a good path.   Not only that, if the main panel were ever to become a sub-panel (like behind a generator transfer switch), it's much easier to do that install.