This document summarizes methods for improving clients' websites through careful testing and optimization. It discusses conducting detailed health checks, planning tests of new designs and content, testing hypotheses with A/B tests, and using analytics to monitor performance. It also provides recommendations for improving conversion rates by focusing on simplicity, relevance, minimizing clutter and decision-making time for users. Tips include matching landing page content to pre-click context, showing social proof from customer reviews, and creating a sense of scarcity to increase perceived value and urgency to convert.