The article provides a comprehensive checklist for API documentation, including an overview and introduction, authentication and authorization guide, getting started guide, reference documentation, error handling, rate limiting and quotas, versioning and deprecation policy, support and community, feedback and contribution, and legal and compliance. Post-launch improvements include updates on community events, SDKs and libraries, examples and tutorials, reference applications, industry use cases and case studies, changelog, standardized terminology, shared product roadmap, search engine optimization, reorganization of documentation, business-focused content for non-technical users, and extended code examples into complete tutorials.