Chris Guillebeau is the New York Times bestselling author of The $100 Startup and other books. During a lifetime of self-employment, he visited every country in the world (193 in total) before his 35th birthday. Every summer in Portland, Oregon he hosts the World Domination Summit, a gathering of creative, remarkable people. Chris also hosts Side Hustle School, a popular podcast that is downloaded more than 2 million times a month.
Hard to understand until you start getting your feet wet. I probably read it twice, then just started doing it and it started to make since. After that, I re-skimmed and felt I learned a lot more from it. Definitely an overall good reference for newbs.