I have a side project with my blog adrianmejia.com. It started as notes for myself of recurrent problems. Over time, It started getting more traffic and it generates some passive income from ads. But mainly, I see it as an opportunity to write about topics I wanted to go deeper while also helping developers with similar issues.
The blog opened the doors for other opportunities, like authoring book. I started turning popular topics into eBooks with more in-depth explanations. This is my first attempt It's called "Algorithms & Data Structures Explained and Implemented in JavaScript" gum.co/dsajs. Let's see how it goes :)