Creating passive income is the key to retiring, especially retiring early. If you want to retire early with the stock market you will have to save a huge amount of money, because that money has to last so long and retirement calculators depend on you using your investment to fund your life. With passive income you will have income coming in as long as you own the investment, without every eating away at the principle invested. Creating passive income may take more work than investing in the stock market, but I think it is well worth the extra effort!
I’m somewhat embarassingly reminded of Harry Potter and the concept of “Horcruxes” here, in that the goal is to find a piece of your value, and impart it into an inanimate object or product, Voldemort Style (did I really just make a Harry Potter reference?) Anyways, whatever. If you want passive income, you have to think about the value you rent out or own. Or, you need to buy something valuable that other people would like to use (I love the idea of a 3D Printer). Then put it into something that can be sold or rented more passively. Maybe you have a car that sits in the driveway, or a vacation home that is empty half the time. Maybe you just have some funny jokes you could put into a YouTube video and run ads on. At some point, you have to “transfer” the value into something that can work for you — that something is an asset.

Returns on real estate investing vary and you don’t want to get into the business based on an estimated return but on your own calculation of what is possible for your local market and for specific properties. I have seen pretty common averages between 8% and 12% a year for single-family residential rentals with cash flow accounting for between 0% and 6% of the return.
How To Engineer Your Layoff – In 2012, it took me four months of absolute focus and two years of data to publish my first e-book about helping people negotiate a severance. The book went through over 30 revisions by four people. Then I updated the book for 2018 with 50 more pages (150 pages total) using more successful case studies and highlighting more strategies for those who want to break free with money in their pocket.
I want to develop a passive income stream in the next 4 years, nothing grand, maybe an extra 500-1000 dollars a month, but I’m not sure how to go about it so I was wondering if you had any tips. I’m so-so as a writer, and am currently finishing up my second book (just write as a hobby), and in the past made about 30-50 dollars an hour as a free lance writer but that was a couple of years back, it was only for about 10-20 hours a month, and the gig just dried up. I just got particularly lucky with that. I’ve tried online poker as a means in the past, and which I learned A) was not passive income but hard work and B) I have an addictive personality which resulted in me losing the 4g I earned in 6 weeks over the span of 72 hours so that’s out of the picture. I also partook in some illegal selling of things when I was younger, but being a little older and wiser the risk-reward ratio for possibly ending up in Jail just doesn’t match up. I tried making three businesses (dog walking, house cleaning, and personal assistant) and while those all were succesful to varying degrees and earned me about 15-25 dollars an hour, they weren’t mobile and quiet honestly I don’t have the time to be a full time dog walker or run a house cleaning operation seeing as I’ll be in school, work, and athletics.
For those who prefer a more do-it-yourself style but still want their investments to be managed automatically, a robo-advisor like Betterment may be better suited. After completing an initial questionnaire, this program will automatically invest your money based on things like your risk tolerance and time horizon. They’ll even rebalance your portfolio when necessary – all automatically, of course!
Investing in rental properties: Another form of real estate investment, rental investments (i.e. becoming a landlord) could steer you down the passive income path of steady monthly rent checks that you can use to pay off a mortgage loan on the rental property. After the mortgage is paid off, those monthly checks go right into your bank account -- potentially for years to come. 
If you have specialized knowledge in a certain topic, you can put together an online course to teach others. For example, if you have experience in real estate investing, you can create an online course “Real Estate Investing 101”. The benefit of an online course is that once you create the course material, you can sell it to as many people as you want.