I’ve been almost completely using automatic white balance for my photography, but as I move more into video I’m starting to reexamine my reliance on AWB.
Lately I’ve been experimenting with apps, grey cards and even this little lens cap thingy…
You cover your lens and point it at the light and take a picture. It’s kinda cool but I really haven’t used it yet 
So what do you use for setting your white balance and why?
Cool lens cap thingy. 
I used to do school portraits for our homeschool co-op. Different colored shirt wreaked havoc with my Nikon D3100 so I tried grey cards but I never got the hang of it. The auto WB on my D500 is either a lot better or shooting with just available light instead of studio lights is a better fit for me. Looking forward to hearing other responses! And keep us updated on your progress, too!
I think I’ve gone down the rabbit hole on white balance 
I’m thinking a grey card would likely be the easiest if I just shoot it at the start of each new lighting setup…but I’ve also been looking at handheld light meters. I have an app on my phone that will tell me the temperature of my light but I have a feeling it’s not very accurate.
Since I used to be the manager of a photo processing lab, I have tendency to color correct a photo afterwards rather than worry too much about the WB at the time. 
Did you know that in general, women can see colors better than men? It has to do with the number of rods and cones in the eye, which is also the reason why women are rarely colored blind.
I can definitely believe that! I’m often told my color combinations are terrible