I have a WP blog that I wrote about my experience becoming a licensed professional engineer, which basically entails writing up your experience and taking an ethics exam. At the time I did it to make myself accountable to follow through. It is a super niche area, but with very little content addressing it, especially for free. Years later, with hardly any work from myself, the traffic is not high (2-3k monthly) but the Adsense more than pays for the hosting and I also generate revenue through affiliate sales to someone that sells paid help with the application. That revenue has been roughly $100-200 a month with as high as almost $500, during exam season.
The site is pretty much as passive as it gets at this point. I maybe spend some time every once in a while answering questions posted the blog, but haven't written new content in years.
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I have a WP blog that I wrote about my experience becoming a licensed professional engineer, which basically entails writing up your experience and taking an ethics exam. At the time I did it to make myself accountable to follow through. It is a super niche area, but with very little content addressing it, especially for free. Years later, with hardly any work from myself, the traffic is not high (2-3k monthly) but the Adsense more than pays for the hosting and I also generate revenue through affiliate sales to someone that sells paid help with the application. That revenue has been roughly $100-200 a month with as high as almost $500, during exam season.
The site is pretty much as passive as it gets at this point. I maybe spend some time every once in a while answering questions posted the blog, but haven't written new content in years.