I want to make money from a product but I don't have a good idea for SaaS or anything physical for that matter.
But I have niche technical knowledge such as blockchain, cryptography, functional programming etc and a knack for explaining it well.
I figure publishing and selling a technical course is a good intermediate step towards making money outside of a job.
Is there still demand for technical video courses out there or is the market flooded?
This takes time and dedication.
Try starting small. I made so far 1.5k for a course published on udemy that took me around 2 months to develop. It's not bad money (in fact so far moneywise my most successful side project) but in no way comparable to what I would earn as a developer. It was fun and educational for me but I see this as a marketing vehicle to drive consulting business to me rahter than my main source of income.