What is your greatest strength why did you leave your last job?

These are common job interview questions - the key here is to give an explanation of what you are really good at, without seeming to boast about it.

Statements like "I am a team player, and enjoy the feeling of a job well-done" or "I like to deal with details, and make sure to get things right" are common - make sure to tailor your response to the job you want.

Regarding the reason why you'd leave a job, make sure not to bad-mouth the company or your previous manager, or to disqualify yourself from your current job by stating you made many mistakes or are somehow unfit.