Five very fast ways to better understand a new product or market, article by Ethan Mollick
How to plan an MVP, Michael Seibel, YCombinator
Wonderful video on how Rapid Prototyping was used in the development of Google Glass
A few no-code tools to build your app/website:
Webflow, Figma, Bubble,
Which kind of experiment should you run? This article provides some guidance on when different type of experiments (survey, listening to customers, smoke tests, ethnography) is most valuable
How to make sure you are building the right product before investing in building your product right? By Alberto Savoia
A/B testing tools
Mailchimp, tool for A/B testing email campaigns: link
And Optimizely or Google optimizer for websites
Smoke testing
Mock-up websites