Many people in the investment world also define residual income as revenue stemming from a passive source. This revenue is created without a direct input of effort or time. The investment itself creates addition revenues without having to be managed. Some examples include royalties, dividends, interest, and rent. Take a dividend stock for example. Once the money is invested once, it will keep producing a dividend every year without having to input additional time or resources. This concept is the Holy Grail for most investors.

If you don’t have an IRA or 401K, then not only are missing out on a great opportunity to earn passive income, but you are likely paying way more in taxes than you should be as well. By opening an IRA with Betterment, you can save up to $5500 of income without having to pay income taxes on that money. Betterment will then automatically invest that money for you using their proven investment strategies.
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. 
With the above-mentioned residual income ideas, you’re assured that you be financially free from problems. This is due to the fact that these ideas can truly help you out to acquire a huge amount of residual income. But, remember not to limit yourself to the above-mentioned ideas since there are still lots of ideas you may invest in depending on your situation.
Get Out Of Debt - The less money you’re paying in interest to creditors, the more money you have in your pocket each month. Talk is pretty a simple form of passive income. Although it will take some discipline on this path.  Getting out of debt quickly can increase your income even more because you’re no longer paying interest to creditors each month. 
If you’ve got a book you’re itching to write, you can still go with the traditional publishing route. (We published our first book using a traditional publisher.) Whether your book is fiction or non-fiction, a publisher can help get your book into print and onto shelves in both online and traditional book stores. This is still a good route, although it may take more work and be more expensive than some other options.
Write A Book - Once the initial work of creating the book is done, and you’ve spent some time developing an effective marketing plan, selling books can be a great way to produce residual income.  Once your book is available on a site like Amazon, you could receive a check each month for doing absolutely nothing. Obviously, the more time you spend marketing, the more money you’ can potentially put in you bank account.
Establishing residual income allows you to accumulate wealth faster, have a more flexible lifestyle and maintain a diverse financial portfolio. As with any successful investment, hard work is required. With residual income, however, that work tends to be upfront. Once your revenue stream is established, the work and time involved is significantly lower than active income sources. With residual income, you’ll secure funds for your future, have a better idea of where you stand financially and enjoy peace of mind knowing you’re maintaining lucrative, long-term investments.  

Residual income is money that is earned on a recurring basis, typically as the result of a single original action. Rather than earning an hourly wage, residual income is typically generated through an initial investment of time or money with the goal of earning continuous payments. Once the initial investment, product, or service is made, the ongoing income that is earned is generally passive in nature.
Investing in coins and collectibles: Buffalo nickels and Spiderman comic books are good examples of coins and collectibles that can rise in value, and thus offer opportunity for passive income investors. You'll need to get up to speed on the value of any coin or collectible under consideration, but once you do so, you're on the way to price appreciation on a commodity you'll be paying a lower price to buy, and will garner a higher price when you sell.
​Self Publishing is mainstream today. When you purchase an eBook off of Amazon there’s a pretty good chance you’re buying a self-published book. Self-publishing is also ridiculously easy. I tried this a few years ago and couldn’t believe how simple the process was. To self-publish a book you’ll first need to write and edit it, create a cover, and then upload to a program such as Amazon’s Kindle Direct Publishing. Don’t expect instant success though. There will need to be a lot of upfront marketing before you can turn this into a passive income stream.
When I purchase an existing online business, I look for cash flow over the past year and where the money comes from. I want the sources to be more passive so that it does not take a lot of my time. Also, typically I will make an offer that is 18 – 24 months of profit so that I know that I will get my money back within the next two years. I hope that helps!
You can join Wealthy Affiliate for free and kick the tires, learn the basics and ask all the questions you wish.  No credit card needed and you can build your first two websites absolutely free.  Just about every other business opportunity out there will charge you upfront and simply leave you with nothing in your pocket and a lot of disappointment.

“There is no such thing as 100% passive income,” says Flynn. “Even with real estate you still have to manage your properties, or even with the stock market, which is potentially passive income, you still have to manage your portfolio. With online business, there is no such thing as 100% passive income — and this is coming from a guy with a blog called The definition of passive income is ‘building these businesses of automation,’ but in order to keep them automated and keep that trust going with your audience on top of that, you do have to keep it up every once in a while — so a lot of time upfront and a little time after. But there is alway time involved.”
Vanguard: Vanguard has a minimum of $50,000 and a fee of 0.3%. Rebalancing is done automatically once every quarter and tax loss harvesting is done on a client-by-client basis. We included Vanguard because clients who invest between $50,000-$500,000 have access to a team of financial advisors. Those with accounts over $500,000 will have a dedicated advisor.

Unfortunately, I can’t answer that conclusively one way or the other. It all depends on you, what you like to do, your work ethic, personality, etc. If you are a good writer perhaps you could write a book and make money that way. Or, you could start your own website and do affiliate marketing. Just because you are young it doesn’t mean you can’t make money doing at least a few of these ideas. I wish you luck in your money making efforts!

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The underlying idea is that investors require a rate of return from their resources – i.e. equity – under the control of the firm's management, compensating them for their opportunity cost and accounting for the level of risk resulting. This rate of return is the cost of equity, and a formal equity cost must be subtracted from net income. Consequently, to create shareholder value, management must generate returns at least as great as this cost. Thus, although a company may report a profit on its income statement, it may actually be economically unprofitable; see Economic profit. It is thus possible that a value deemed positive using a traditional discounted cash flow (DCF) approach may be negative here. RI-based valuation is therefore a valuable complement to more traditional techniques.
If retirement is a goal of yours (and who doesn’t want to retire someday?!?), it’s important to learn how to start investing. In fact, funding your retirement accounts should be at the top of your list. While these accounts won’t help your immediate situation, by stashing cash now, the residual income they create should help propel you through your golden years.