Legitimate and consistent way to make about $500/mo working remotely?

Hello all, this question might be bashed for being rather vague. I am wondering if anyone can offer advice on where to look for a legitimate way to work remotely/via the internet to the tune of about $500/mo? A google search just reveals page after page after page of spam.

I’m not looking to “make 10,000 a month filling out surveys!” or any of that crap. I am a highly-educated hard-working person willing to do legitimate work and put in hours either for myself or working for a company, but my goal is to make just a little on the side from my full-time job.

If anyone has any advice it would be greatly appreciated!