Contributed targeted documentation enhancements to the qiancai/docs repository, focusing on new optimizer controls and the Index Advisor feature in TiDB. Over two months, delivered updates that clarified the use of plan caching variables for generated columns and detailed the exploration of enforced plans during query optimization. Authored comprehensive guides for RECOMMEND INDEX and hypothetical indexes, providing practical examples to support user adoption and reduce support overhead. Leveraged Markdown and technical writing skills to align documentation with recent software versions, improving onboarding and best practice adherence. The work emphasized clarity, discoverability, and actionable guidance for developers integrating new database optimization features.