I need a way to earn some additional income that I can do whenever I have free time. What are some flexible gig options?

We ask the same underlying question in different ways.

• I need a way to earn some additional income that I can do whenever I have free time. What are some flexible gig options?
• I'm looking for side hustles that I can pick up and drop whenever I have a spare moment. Can you suggest some flexible ways to make extra money?
• I'm looking for side hustles that I can pick up and drop whenever my schedule allows. Can you suggest some flexible gig work?