Here is how you make good money in your spare time:
Go back in time, get a degree in mathematics, teach high school for 4 years.
Move to Cashburn (Ashburn, VA) and let a few friends know you tutor.
Within 2 years you’ll have more students wanting your help than you have time for. And at a MINIMUM of $45/hour, you’ll be doin’ just fine.
*In all seriousness, I think I’m working waaaaaay too many hours and might have to consider changing my personal money-making plans in the future.*