color is pretty simple really.

when fishing plastics, purple, black, watermelon pepper/seed, and green pumkin will work 99% of the time - just pick one.

jigs, white, black/blue, brown will all work - just pick one anda matching trailer.

topwaters - i dont think it matters as long as the belly is white.

and crankbaits, try and match what the bass are feeding on - look in the shallow for minnows. on the lakes I fish, there is almost always someone throwing a cast net at the launch for the day's bait. Ask them to show you one of the baitfish, and match is as closely as possible.