Writing a book is an incredibly challenging task, and one that can take years to complete. Once the book is written and published, it doesn’t take any effort to maintain – unless you revised it down the road due to a change in your field. The risk is that no one downloads or buys your book, but there is considerable upside if you manage to find a following. There are a number of places to publish books online these days like Amazon.

It’s easy to think as passive income as money earned while sitting on a beach sipping mojitos, but there is lots of work involved, says financial coach and retired hedge fund manager Todd Tresidder. If you’re worried about being able to save enough of your earnings to meet your retirement goals, building wealth through passive income is a strategy that might appeal to you.

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There are dozens of ways to generate passive income. However, the option you select has to do with two metrics: time and money. Either you have a lot of time or a lot of money. Most people usually don't have both. But, if you have a lot of money, generating passive income almost instantly is easy. You can buy up some real estate and begin enjoying rental income. Or, you can invest in a dividend fund or some other investment vehicle that will begin generating a steady income for you.
If you have a blog or some other property that has visitors, you might profit passively via affiliate advertising. For example, imagine that you write a blog about movies. You might review some books about movies, and then link to them on Amazon so you get a cut of the purchase price when anyone buys books through the links. If you blog about hiking, you might promote some hiking gear you recommend on the blog, again generating passive income if anyone buys any of it.
Your income is your greatest wealth-building tool—a tool that typically requires your active participation in the form of a full-time job. You know what I’m talking about! Even if you love your job, I’m willing to bet you wouldn’t mind earning some extra income without the blood, sweat, tears, and time commitment of another job. In fact, there are several benefits. Building a passive income:
The Blendtec viral video series Will It Blend? debuted in 2006. In the show, Tom Dickson, Blendtec founder and CEO, attempts to blend various unusual items in order to show off the power of his blender. Will it Blend? has been nominated for the 2007 YouTube award for Best Series, winner of .Net Magazine's 2007 Viral Video campaign of the year and winner of the Bronze level Clio Award for Viral Video in 2008.[71] In 2010, Blendtec claimed the top spot on the AdAge list of "Top 10 Viral Ads of All Time".[72] The Will It Blend page on YouTube currently shows over 200 million video views.[73]

Real Estate: I currently own one rental property in San Francisco which I bought in 2003 (2/2 condo), one vacation rental in Squaw Valley, Lake Tahoe (2/2 condo), and my primary residence. Real estate is my favorite asset class to build wealth because it is easy to understand, tangible, provides utility, and rides the way of inflation. I recommend individuals try and get neutral inflation by buying their primary residence as young as possible. The power of inflation is just too hard to counteract.

Speaking of credit cards, if you don't use them to rack up debt, you can instead use them to generate income streams for you -- via their cash-back or rewards programs. Some cards offer flat-rate cash-back percentages up to about 2%. Others target certain kinds of spending or certain retailers. If you spend a lot at Amazon.com, for example, you can get a card that rewards you with 5% cash back there -- which can really add up. (It's not hard to spend $250 per month at Amazon, which is $3,000 per year -- enough to earn $150 back.)

Real Estate Crowdsourcing – After selling my SF rental house in mid-2017 for 30X annual gross rent, I  reinvested $550,000 of the proceeds ($810,000 total) in real estate crowdfunding, based in San Francisco. My goal is to take advantage of cheaper heartland real estate with much higher net rental yields (8% – 12% vs. 2% – 3.5% in SF) and diversify away from expensive coastal city real estate which is now under pressure due to new tax policy which limits SALT deduction to $10,000 and new mortgage interest deduction on mortgages of $750,000 from $1,000,000 for 2018 and beyond.
Viral marketing or viral advertising is a business strategy that uses existing social networks to promote a product. Its name refers to how consumers spread information about a product with other people in their social networks, much in the same way that a virus spreads from one person to another.[1] It can be delivered by word of mouth or enhanced by the network effects of the Internet and mobile networks.[2]