I would like to know exercises that are helpful for arm wrestling content only?
I don’t know that there are any “best” exercises for arm wrestling. But, I would assume that any exercise that targets the muscles involved in arm wrestling would be of benefit. To that end, I would tend to train forearms (hammer curls), biceps (curls), triceps (extensions), and, probably shoulders (presses). A strong forearm should help with your grip. Strong biceps and triceps will help stabilize your arm against your opponent. And, lastly, strong shoulders may provide that last little push when your opponent is susceptible to being pinned. If you’ve got a set of dumbbells available, they should allow you to train each of the body parts I’ve listed.
Arm wrestling is more about technique than strength. Check this video. https://www.youtube.com/watch?v=IkkL-bAH8H4
The world's strongest man competition winner loses to professional arm-wrestler. he has the strength and he's twice the size of the winner, but he lacks skills. Of course strength is required, but without technique, it's of no use.