1) The document discusses different approaches to user testing, including moderated vs unmoderated testing, prototyping full apps vs prioritized stories, and personalized vs aggregated feedback. It suggests balancing these approaches to learn quickly. 2) It recommends prioritizing the riskiest assumptions and most important things to learn when deciding how much of a design to prototype. 3) For quick prototyping, it suggests focusing user stories into specific tasks that can then be tested through a personalized scenario walkthrough. This allows learning patterns across participants.