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(Legitimate & respectable) strategies to generate “passive income” on the Internet?
One idea that I read among some of the many, many personal finance blogs out there is to create a niche website with good content and generate some ad revenue. The example the author gave was a website he'd made with some lessons to learn basic Spanish. Something as specific as that has a reasonable chance of becoming popular even if you never post new content (since you were looking for passive). The ad income won't be great, but it's likely to stay > 0 for a significant while.