The topic of buying and selling blogs deserves it’s own book though and is a very difficult skill to master I must say.  I rant about the greatness and simultaneous pitfalls of marketplaces like Flippa elsewhere on this site, but needless to say I think this is it’s own expertise; worth learning more about for a lot of us who know that starting a business (getting momentum) is a lot tougher than fixing up and steering an existing business to greater profits (maintaining and directing momentum).
Start Something That Matters – Book by Blake Mycoskie, founder of Toms shoes. It’s a great intro to the world of social entrepreneurship. For those who don’t know what Toms is famous for, they donate a pair of shoes for every shoe sold. In a nutshell, this book has strategies on building businesses, a heavy dose of inspiration, and ultimately makes you feel like it’s possible that your one idea could change the world.
What Every Real Estate Investor Needs to Know About Cash Flow – The focus of this book is making sure that you have a deep understanding of the numbers that drive a good real estate investment. The key emphasized here is that investing for cash flow is preferable to speculation. There are some great case studies in the book for those who learn well using those.

Another benefit of investing in rental properties is the loan pay down. If you obtain a loan to buy the property, each month your tenants are paying off part of the loan. Once the mortgage on the property has been paid off, your cash flow will increase dramatically, allowing your mediocre investment to skyrocket into a full-fledged retirement program.
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.
Most credit card companies offer sign-up bonuses to entice you to open a credit account with them. As long as you don’t spend money just to hit the minimum balance and always pay your balance on time, this can have a minimal impact on your credit score while earning you hundreds – or even thousands – of dollars a year. Some of the best travel credit cards offer 100,000 points to new accounts when you meet reasonable spending requirements.
They've delegated, automated, streamlined, systematized, etc. Not with the intention of sitting on some beach somewhere for the rest of their lives and watching the checks roll in, but with the intention of freeing up their time to create even more value that they're inspired to create, either by leading that business to the next level of greatness and service to greater audiences, or by starting a new business.
As always, I’m here to answer questions (within my ability) and I can always help you find that YouTube tutorial you need. When you are REALLY ready to start taking your blog seriously, I have many resources available on my learning site, Adventures in Blogging. The Income & Traffic Bundle is a great place to start if you’re dying to learn everything you can about traffic & income.
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.
Truebill is an app that helps you save money by identifying recurring subscriptions and other bills and helping you cut costs by negotiating better rates and fees. One of their partnerships is with Acradia Power, which has the potential to save you up to 30% on your electric bill. It searches for better power rates in areas where competition is allowed, and it locks in the better prices for you.
Those who can reap the benefits of residual income have typically put in an immense amount of effort and time in the beginning to be able to enjoy the rewards later on. Residual income, therefore, does not result in instant gratification. Those interested in earning residual income must have a lot of patience and determination to work as hard as necessary to achieve their ultimate goals of a long-standing income stream.

This book is a definite must read, and in the top 5 out of this list.  My favorite use for this book is to help people decide what business model to pursue – for a start anyway.  ie info product v membership site v affiliate marketing.  Since Joel compares them all and shows you the major challenges for each (along with how-to guides), the task becomes a lot easier.