On the blog aspect, you need to keep posting regularly, otherwise ultimately your traffic will tank (and so will your revenue). That can also be outsourced to some extent: you can pay people to write for you. But your audience are not morons: if you’re open about it they might be ok with it once in a while. If you’re not open about it: they’ll notice.
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Another way to generate passive income is to invest and be a silent partner in a business. This is very risky, but with risk comes the potential for high returns. For example, several years ago both Lyft and Uber were looking for private investors to invest in their companies. Today, they are worth billions - but you as an investor would only reap that benefit if they go public via an IPO, or get acquired. So, it's risky.
As you can see, I linked the word PDF with a tool that could help readers if they had the same problems, thus giving them a way for them to solve the same problem if they had it, while earning money from their downloads and in-app purchases. I haven’t actually placed my referral link as this is an educational article, but the principle is the same. That link doesn’t have to be an app, it can also be a page on Amazon, or a link towards some other online store that offers commission for affiliated sales.
Investing in the stock market is a classic form of passive income. As you might know, with stock markets, there is some risk involved. But then again, virtually all residual income methods involve a level of risk, and you won’t find any idea that’s risk-free. In fact, stock marketing can be one of the least risky ways to earn money, if you invest smartly. The basic rules apply: Create a diverse portfolio, start with around $1,000, learn about the stock market, and create a back-up fund.
Similar to what Chris Guthrie did with his Amazon niche sites back in 2008-09, you should take every dollar you earn and reinvest it into your passive income business…pay for more content to be created, for better (and quality) backlinks to be built, to buy new niche sites etc.  At least for the first few years.  Chris did this, and it allowed him to go from $0 to $100,000 in just over 12 months.