Last tidbit, try shooting an object from different distances to help you get a judgement on what ranges require which f/stop. Take notes, but try and memorize it. Consider it DOPE for your flash.
lol protip: Angle it up and diffuse the bastard. If the light already doesn’t have a diffuse filter a piece of computer paper and some scotch tape works just as well. Same trick to make a cone diffuser as well.