What’s your favorite post, video or book on startup growth?

Books:
Channels: Traction,
Testing: Sprint,
Strategy: Good Bad Strategy,
Network effects: Cold Start Problem, 
Positioning: Obviously Awesome,
Communications: Made to Stick,
Talking to users: Mom Test,
Biz Dev/Sales: Challenger Sale,
Content marketing: They ask you answer

Building @kiwi 
Writing @ https://kanfa.macbudkowski.com/

This are all awesome! If I were to add one it would be

 Marketing: alchemy by Rory Sutherland (the audiobook is great too as he is a fantastic storyteller)