Conversion rate optimization (CRO) involves making small, incremental improvements to websites and digital experiences to improve conversion rates. Amazon is an example of a company that has continually optimized its site through testing features like personalization, content targeting, and automated optimization. To get started with CRO, companies should focus on discovery by understanding user behavior and asking questions. This informs a testing strategy where elements like trust indicators, layouts, calls to action, and value propositions can be tested through A/B or multivariate testing to identify the highest performing variants.