If you have a knack for a certain subject and live near a college, consider offering up your brain power and teaching skills for some quick cash. Grade school kids need help too, and parents pay better than college students. You can take this idea to the next level and scale by tutoring online. We have an interview post dedicated to a chemistry tutor who took his skills to Tutor.com.  To be successful, you have to have a good grasp of the concepts but also be able to find a way to relate topics using real-world examples.

7. Sell your skills as a freelancer. You might be surprised by the tasks people are willing to pay to have done. A skill that seems ordinary to you might be extraordinary to someone else, such as dog walker, Website designer, home organizer, marketing consultant, or personal cook. There is no reason you can't sell the skills you already have for some extra money.
If you’ve got some free time and don’t live in the middle of nowhere, becoming a Lyft driver can be a very lucrative side hustle that allows you make money fast. And right now, they’ve got a promotion going on where any new driver will instantly get a $300 bonus after completing their 100th ride. If you start now and hustle hard on the weekends, you can probably unlock that bonus within a few weeks of driving (and that’s in addition to your normal earnings).