This document outlines 9 lessons for conversion optimization: 1) Mindset of an optimizer 2) Conversion research 3) Google Analytics for CRO 4) Mouse tracking and heatmaps 5) Using website surveys 6) User testing 7) From data to test hypotheses 8) Getting A/B testing right 9) Learning from test results. It discusses gathering data through technical, heuristic, web analytic, mouse tracking and qualitative analyses to form hypotheses and run A/B tests. Key aspects covered include measuring important KPIs in Google Analytics, using heatmaps and surveys to understand user behavior, implementing tests based on ease and opportunity, ensuring sufficient sample sizes, and learning from all test results.