Sports like rock climbing, wrestling, judo, jiu jitsu, BJJ, volleyball, and basketball can sprain fingers or put gradual wear and tear on your knuckles from the daily grind.
Thin medical tape specifically designed and cut for fingers, such as Tape Armor will provide you with the necessary support to prevent injury and help recovery.
Here is a basic single hand taping technique for BJJ and Judo that will allow you to have a stronger grip for competitions all while reducing the chance of injury to the hand by separating the knuckle: