Many online job platforms such as Upwork.com also have their own system for recognizing and removing job scams. According to the site, many of them involve “employers” who try to pay workers outside the site’s payment system, and engage in some sort of check or money order fraud. For more tips on avoiding job scams on freelancing sites, read about it here.
The online application process for these jobs—or perhaps “gigs” is the better word, since they're all for independent contractors—is pretty simple and straightforward with very little required of candidates. Some of these opportunities—like the micro-jobs—you could very well apply and start the same day. And these jobs require very little commitment and can typically be done on your own schedule.