Back in the early '70s (that would be in the last century for all you digital natives) I read Winning Through Intimidation by Robert Ringer, the little tortoise who could. The only two words in his book that are underlined are: Get Paid. That phrase stuck with me for the rest of my life, but it took me a while to learn to put it into practice.
To this end, Larry Correia of Monster Hunter Nation has written several articles that are well worth reading. The series begins when some unknown contributor with nothing but time on his hands manages to ruffle Larry's feathers. Here's the link to this story, which should be read at your own risk: File 770 Is Mad At Me Again. Larry goes on to explain exactly how authors get paid (or not, as the case may be) in How Authors Get Paid, Part 1 and How Authors Get Paid, Part 2. All of these articles are easy reads and well worth your time.
The part that Larry doesn't cover is that, unlike the rest of the world, the typical author isn't fighting with an employer or a client about a contract, a bounced check or the real meaning of net-30. The typical author is battling obscurity, and in order to Get Paid you must first beat obscurity three falls out of three.