I have phlox, yarrow and bee balm, and they are mostly done blooming now. Do I cut them off at the ground? Just cut off the dead blooms? Will they bloom again this year? I don't know how to care for them now that they are done blooming.

Just deadhead, don't cut to the ground. Not sure about the phlox, but you *might* get a sprinkling of repeat blooms on the yarrow and monarda.

My phlox rebloom after deadheading them.

My yarrow reblooms sometimes if I dead head it