小蕾之前从未接触过转化率优化，但希望能快速上手。 她应该将以下哪个步骤作为首要任务？

The correct answer is to use data and user feedback to identify areas for improvement. This is the foundational first step in Conversion Rate Optimization (CRO). Without understanding current performance and user behavior through data analysis (e.g., analytics, heatmaps) and qualitative feedback (e.g., surveys, user interviews), any changes made would be based on guesswork rather than evidence. Communicating with the developer team about implementing adjustments is premature; you first need to know what adjustments to make. A/B testing the homepage is also premature without a clear hypothesis derived from data. Proposing hypotheses based on personal preferences is a common pitfall in CRO, as it often leads to testing assumptions that aren't grounded in user needs or data insights.