The heel hook is a submission hold in Brazilian Jiu-Jitsu (BJJ) that targets the ankle and knee. The steps to performing a heel hook are as follows:

1. Start in a top position, with your opponent lying on their back and you on top of them, or in a guard position.
2. Control your opponent’s leg with your hands, keeping their ankle and knee close to your body.
3. Reach over your opponent’s leg with your other leg and hook the heel with your ankle.
4. Use your heel to control your opponent’s ankle and rotate it towards their knee.
5. Use your hands to control your opponent’s knee and rotate it in the opposite direction of their ankle.
6. Keep your opponent’s leg controlled and maintain pressure on their ankle and knee until they tap out or submit.

It is important to note that it’s important to maintain control over your opponent’s knee, otherwise they can easily defend the submission. Also, It’s important to keep your legs in a good position in order to maintain leverage and apply pressure on the ankle.

It’s also worth noting that heel hook is a very powerful submission hold, but it can be dangerous if executed improperly. It’s important to learn proper technique and control, and to always be aware of the risks involved. Also, heel hook is not legal in all BJJ competitions and tournaments, so it’s important to check the rules of the event before attempting this submission.