When selecting a development stack for a side project, you need to maximize the amount of time that you have available for actually getting things done. The goal of a working side hustle is to make extra money on the side, not to be vehicle for exploring a new framework, language, or approach.
Whether it is producing content such as podcasts, blogs, and videos, consulting, or building applications for personal use or for sale, or even creating other content like music and books, there is a lot to be gained by hustling on the side, a lot of which is much more difficult to get in a regular job. Taking on a side project can help build your career and your skills, provided you do it in an intelligent fashion. If you are considering starting a side project of your own, an early awareness of the upsides and downsides can save you a ton of pain and frustration.