If you happen to have a blog that attracts a large, devoted viewer base each day, then selling branded products on it is an excellent way to make a little extra money. Things like t-shirts, posters, mugs, and bags that feature your brand name, or some witty copy that your niche may find attractive, will definitely find buyers on your site. You can also link up with affiliate marketers to drive more sales if the business seems to be working out.

If you are an expert in some area, which you think can be taught to others by creating a course out of it, you can always sell it on udemy.com or skillshare.com and make money on the fees recieved by the students. So if you are an expert on cooking, Yoga, SEO , Designing, MS Excel, Java, Python … whatever.. Create a nice rich course , record your videos and done ! .. You can tie up with these websites and then earn a lot money. Just understand those models and work on it.
Investing in a business: Another good way to generate passive income is to invest in a business --even a small one -- in return for a percentage of the profits - just like Shark Tank, only smaller. Lending $10,000 to a local business that, for example, is working on a mobile app for Apple phones could lead to a passive income-generated share of the profits when that mobile app starts selling like hot cakes.
Blogging is still going to take work starting out. That path to $5,000 a month didn’t happen overnight but just like real estate development, it build up an asset that now creates constant cash flow whether I work or not. I get over 30,000 visitors a month from Google search rankings, rankings that will continue to send traffic even if I take a little time off.
According to Uncle Sam, you need to be "materially involved" in an enterprise to earn active income. With passive income, it's just the opposite, as the IRS deems you to be earning passive income if you're not materially involved with a profit-making enterprise. By and large, expect income to be taxable if you are engaged in a passive income enterprise. You will need to report earnings to the IRS.
These days, low-risk bond yields aren’t enough to meet most income needs. When investing in bonds, the income typically comes as coupon payments – contractually guaranteed interest payments at predictable intervals.  There are many kinds of bond income available, so you must strike a balance between reaching for higher income (yield) and limiting risk.
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