If you know anything well, a place, how to fix something, how to make something, how to do something, you can write a guide for it. You can sell your guide as an e-book, offer it as a download for a fee on your site or reach out to bloggers with similar content and ask if they will offer it as a paid download on their website (for a price of course).
Wow! What an awesome list! My favorite is the stock photography because I love photography. I have had some success there, particularly with one photo I make some decent income from. I think the key with stock photography is finding a shot that is high demand. Then, find a new unique way to frame that shot. This is the reason my St. Louis Arch photo is a top 10 on both ShutterStock and iStockPhoto. Thanks for the awesome ideas above!
Perhaps a coworker purposefully tries to make your life miserable because they resent your success. Maybe you get passed over for a promotion and a raise because you weren’t vocal enough about your abilities, and mistakenly thought you worked in a meritocracy. Or maybe you have a new boss who decides to clean house and hire her own people. Whatever the case may be, you will eventually tire.
​Udemy is an online platform that lets its user take video courses on a wide array of subjects. Instead of being a consumer on Udemy you can instead be a producer, create your own video course, and allow users to purchase it. This is a fantastic option if you are highly knowledgeable in a specific subject matter. This can also be a great way to turn traditional tutoring into a passive income stream!

You are also free to choose a fund that is based on any index that you want. For example, there are index funds set up for just about every market sector there is — energy, precious metals, banking, emerging markets — you name it. All you have to do is decide that you want to participate, then contribute money and sit back and relax. Your stock portfolio will then be on automatic pilot.
Residual income can be calculated by taking the difference between the company's net income and its equity charge, where equity charge is the product of equity capital and the cost of capital. For example, a company has $5 million in net income with $20 million in equity capital and a cost of capital of 10 percent. The equity charge is 10 percent of $20 million, or $2 million. The residual income is $5 million minus $2 million, or $3 million.
Well it all depends on what matters to you most. If you want reliability, security and hassle-free then a linear income is the way to go. If you want an income source that will pay off in the long run, then residual income is the better option. It’s pretty obvious which one most people choose – your traditional 9 to 5 job, being a linear income. Trading your time for your money isn’t a flawed system, in fact, it works very well for some people. But things are changing. With the age of the internet means greater opportunity and many are now looking for ways to spend less time working and more time living – and residual income let’s you do exactly that. Thankfully, earning a residual income is not only limited to investors and business owners – even you can do it!
Of course, there are large fast-food, pet store, and other enterprises that cost a great deal. However, consider a DVD rental machine, soda, or gum ball machines as more passive avenues to income. These require little maintenance, coins, bills, or revenue collected via credit cards, as well as periodic refilling of machines.  These machines are, perhaps, one of the more lucrative paths to a passive income with little input from you.
Part of providing value is building trust. Don’t link to things that aren’t of good quality or people won’t trust your recommendations. The other part of making an audience is consistency. It matters less how often you post than how consistently. If you only have time to do one post a month, that post should come out on the same date and time each month.

What could be a better option than to make money out of your hobby? If you’re a hobbyist who creates some sort of artwork such as sketches, doodles, paintings, etc., you can put these up on a portfolio website with your name as the domain name and sell them. You would need to frame the artwork, but do it only when you receive an order. You can easily build a portfolio website with Pixpa and sell your artwork right from there.

​Network marketing, or multi-level marketing, seems to be on the rise. Companies such as Young Living Oils, Avon, Pampered Chef, and AdvoCare are all multi-level marketing companies. You can earn passive income through network marketing by building a team underneath you (often referred to as a down line.) Once you have a large team you can earn commissions off of their sales without having to do much.
Residual income is the amount of net income generated in excess of the minimum rate of return. Residual income concepts have been used in a number of contexts, including as a measurement of internal corporate performance whereby a company's management team evaluates the return generated relative to the company's minimum required return. Alternatively, in personal finance, residual income is the level of income that an individual has after the deduction of all personal debts and expenses have been paid.