Have tasty treats, a clicker, leash, and training collar ready before each session.
What motivates your dog - food, toys, praise. Use this to reward desired behavior.
Show treat above dog's head saying "sit." Guide into position if needed. Reward for sitting.
Frequently practice "sit" command. Keep sessions short and upbeat. Reward each time with treat
When dog connects word with action, add a hand signal like palm facing up. Use together.
Add Hand Signal
Slowly change locations and distractions level to strengthen the behavior. Stay positive.
Avoid overusing "sit." Ask for it only when you will reinforce with reward.