This document discusses 3 truths of UX design: 1) UX is not the same as UI and focuses on how users feel when interacting with a system, 2) mapping customers' journeys through an experience helps understand their actions, motivations and barriers, and 3) pairing different research methods provides more powerful insights than using methods individually. It provides examples of common UX research methods like journey mapping, tree testing, first-click testing, top tasks analysis, and user testing to evaluate different parts of a user's experience. The document emphasizes that understanding the user experience requires studying how users feel about a system through various qualitative and quantitative research techniques.