As this is where my interest is, most resources will be relevant for start-ups.
These people share information about their experiences that would be hard to come by otherwise.
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Nikita Bier Built and sold the same app twice, once to facebook, then to discord. Shares insights about building social apps.
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Levelsio Serial "indiepreneur" building several AI projects, iterating fast.
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Danny Postma The same as the one above