If you're toying with the idea to pad your income with a side job, this book is a decent start. It gives you some suggestions about what to do, links to further resources (often other Nolo books), and some good tips on topics as diverse as marketing or how to deal with various types of business people, including lawyers. I went through the book easily and found it well- written and understandable.
If you enjoy writing and have a talent for words, then this popular side business idea is right up your alley. Start by creating quality content and building up a subscriber base among your readers. Monetize your blog by featuring advertising, adding products to sell, and setting up affiliate marketing. Between these different revenue streams, you can earn a nice profit from something you already enjoy doing.
Even if you have an income stream that makes up to 90% of the money. When working for yourself, you'll need something different for that other 10%. This not only provides an outlet for creativity but diversifies your income in the event something happens with that primary revenue source. Again, this may not work for everyone but for ME and MY EXPERIENCE, being able to branch out into other ways of making money besides freelance writing made my time as a solopreneur a lot more bearable.
Another option for earning a side income is to deliver for PostMates. Similar to working for Uber and Lyft, you can work whenever you want. While the pay might not be enormous, you do have the ability to earn tips. If you're in a highly-trafficked area such as Los Angeles or New York City, this is a great way to earn some cash and you don't even need a car.
Much like a live streaming business, a podcasting business takes a hobby and turns it into a profitable business. You might really enjoy talking about a certain TV show, a sport or hobby, or any number of things. As long as you can dedicate enough time to write and record your podcast, this business can serve as a great way to make extra money while doing something you really enjoy.
As for other tips, all I can say is “a penny saved is a penny earned”. If you are running out of ideas to make money, start saving. Some quick “low hanging fruit” tips to save some quick cash include – switch to MetroPCS or Boost for cellphone (I only pay $20/month), switch auto insurance to Insurance Panda ($25/month), and start using GasBuddy (saves me like $100/month at least. I drive a lot).