Our first attempt was to curate learning resources across various topics in a GitHub repository of markdown files. While that got decent amount of interest, we realized that we needed to build an app to be able to search, add reviews, create learning plans, and follow people etc.
I took a couple of weeks to build the MVP and posted on ProductHunt. I did not do any marketing beyond sharing the link with our existing user community.
Next morning, I was pleasantly surprised to find that ProductHunt had featured LearnAwesome on their homepage.