There are 168 hours in a week, and after you factor in sleep and working your day job, there aren’t many left over. But that doesn’t mean you can’t pursue a new business venture—and if you do it right, your side hustle could quickly become your main gig.

The best side hustle ideas fit in with your schedule, and many offer a flexible work structure that can support your career goals. Whether you want to monetize your creative passion, earn extra income, or add a valuable skill set to your resume, there’s likely a side hustle out there for you.

For example, if you love to make things, you can turn your crafting skills into a profitable business by selling handmade jewelry on sites like Etsy or repurposing second-hand furniture on Instagram. Or if you have a knack for photography, you can make money by shooting weddings or parties on weekends.

You can also make a steady income by providing pet services, from dog walking to pet sitting and grooming. This type of side hustle requires some flexibility in your scheduling, but it can be very rewarding for those who enjoy being around animals.

A popular and easy-to-start side hustle is cleaning windows, which only requires a ladder, bucket, and squeegee, and can be done from your home. Alternatively, you can start a pressure washing service to make seasonal extra cash, or take advantage of your gutter cleaning experience by setting up a mobile Side Hustle.