Hello,
Here are your answers:
1. A commitment to me is a agreement more than one person have that they cant break (its a promise that can not be broken).
2. A commitment would be like a marriage commitment. Two people made a commitment to stay together because of their marriage.
3. It would be better because if I keep the commitment it will show my reliability to other people and keep my friendship, relationship, etc.... safe.
If you need anymore help feel free to ask me!
Hope this helps!
~Noportrit