Readings we often suggest
Make things people want
“When you have an idea for a startup, ask yourself: who wants this right now? Who wants this so much that they'll use it even when it's a crappy version one made by a two-person startup they've never heard of? If you can't answer that, the idea is probably bad.” Pay attention to the metaphor of the well.
http://paulgraham.com/startupideas.html
Experiment quickly, continuously, and cheaply
We use lean methodology
https://ssir.org/pdf/SSIR_Summer_2015_PromiseOfLeanExperimentation.pdf
Important Startup Advice
http://www.paulgraham.com/13sentences.html