"commitment - correct spelling." Grammar.com.

Is commit the same as commitment?

The verb “commit” has numerous related noun forms: commitment, commission, committal and committee. ... When we promise to do something or take on a responsibility, we “make a commitment”. For example: I'd like a dog, but it would be such a commitment, and I simply don't have the time. This usage of the noun is countable.

Does committed have one or two Ts?

Don't write the -ed and -ing forms of commit with only one 't'. The correct spellings are committed and committing: ✗ His wife went mad and commited suicide.