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Thanks for sharing your experience! At Prolific, we found that one good resource for learning about marketing/growth is this book called Traction by Gabriel Weinberg and Justin Mares. It explains 19 different growth channels and instructs you around best practices on how to experiment with them.

On a very basic level, the best way to validate your market & marketing ideas is talking to the right target audience. Often you can do this in your personal circles, but sometimes you need a less biased sample (in which case Prolific might be able to help). Good luck!