"Multiple Streams of Income" by Robert G. Allen is a book is full of great information on how to free yourself from "the rat race." Although some of the information is outdated for our current economic climate, the information is still valuable, and heartily recommend the read. There are many chapters of relevant information to balance anything you may consider unusable. He teaches you that there are many ways to earn money outside of a regular job. He also leads you through determining which avenue is right for you, and gives you all the tools you need to get started on the basics. "Multiple Streams of Income" has helped me alot.
Two months into my work hiatus and I’m doing well. I’ve made a little bit more than I’ve spent and I’ve worked about four hours a day on average. Ultimately, I’ll know I’m ready to make the permanent jump to a 4 day work hour when my passive income plus side incomes equal my day job income. Until then, I’m going to go back to my day job and keep grinding it out.
This can be a little easier said than done, but if you have a large social media following, you can definitely earn money promoting a product or advertising for a company. You can even combine this with different marketing campaigns if you are an influencer and have your own blog (advertisement + affiliate income). This is how many bloggers make money! Again, it is not 100% passive but once set up correctly and then scaled, can be surprisingly lucrative.

Don't mistake passive income with zero work. It's still work, it's just that your income is not directly tied to the hours worked. Anyone who owns rental properties knows that it's considered passive income but there is quite a bit of work involved. The work is front heavy but if you are lucky, you can collect rental checks without incident for many months before having to do work.
There are a plethora of tax write-offs available to real estate investors.  They aren’t quite so generous for those with a high income, but they still exist.  As a general rule, rental income tends to be a lot more stable than many kinds of income.  And sometimes, properties even appreciate allowing for significant capital gains.  Just remember that compared to a stock/bond portfolio, rental real estate tends to be more of a second job than an investment, even if a property manager is involved.
For instance, Richard Branson cannot go through all the activities of each of his 400+ companies, but he goes over the numbers every day to ensure that they are doing well. If he notices any irregularity or drop in income, he calls the CEO to discover where the problem might be and address it. What this means is that you have to monitor your investment day in day out to ensure it is performing optimally.

The more residual income you can build, the better off you’ll be. In fact, it’s said that the average millionaire has 7 different streams of income. By creating passive income streams that generate money while you sleep, you’ll build wealth faster and diversify the ways you’re able to make money – which helps protect you from the loss of any one individual income stream.
The second category of passive income is drawing on sources that do not require capital to start, maintain, and grow. These are far better choices for those who want to start out on their own and build a fortune from nothing. They include assets you can create, such as a book, song, patent, trademark, Internet site, recurring commissions, or businesses that earn nearly infinite returns on equity such as a drop-ship e-commerce retailer that has little or no money tied up in operations but still turns a profit.
What spurred this blog post was an idea put forth by my friend at ESI Money in which he talks about how the first million is the hardest. ESI shares how his net worth growth has accelerated. The first million took 19 years of work (the clock starts when he started working, not at birth!) but the 2nd million took just 4 years and 9 months. J Money took this same idea and started at $100k, which took him 7yrs 11mos. Each of the next $100k milestones took close to 18 months each to reach.
Ebooks, which can be published through sites like Amazon Kindle Direct Publishing, are an increasingly popular option. Because these books are self-published, the process is quicker, allowing you to build residual income faster than the traditional publishing route. Whether it’s a romance novel or a how-to book on fly fishing, you can create a book and have it available for purchase in a matter of weeks.
Many people talk about passive income and create the impression that you never have to do anything to keep that income going. The truth is that you will normally have to keep your eye on things if you want it to run smoothly. For example Richard Branson doesn’t run any of the 400+ companies he started but he goes over the numbers each day to make sure they’re performing well and calls the CEO if there are any problems.