This book is advertised as a guide to side jobs and gigs, but the actual content within is nothing that could not be put together by somebody after less than an hour of Google searches on the subject. That information is not very comprehensive, and the text formatting is almost nonexistent, which makes it difficult to read and process. It may be intended to be general so it covers the widest possible ranges of jobs, but instead it doesn't provide enough useful information in any particular area to justify the price tag.
And considering that it only cost 0.99 USD, that's saying something.
It's a good idea, and the rough framework is there, but the author didn't commit to it. If there's an expanded and updated version in the future, I might risk a few dollars on it, but I can't endorse this particular book its current form.
(reviewed the day of purchase)