Great book with great sources
This book is comprehensive. It starts off with tax forms like 1099's, self employment taxes, and things to be aware of before you jump in.
Great number of websites listed with jobs from babysitting, dog walking, writing assignments, pilot care, camp ground manager, migrant/ seasonal work, handy person, delivery (besides some cash and uber eats), and a lot more.
The listed resources makes this book a good reference source.