Worked on the cpprefjp/site repository to enhance the accuracy and maintainability of C++ Standard Library documentation. Focused on improving documentation clarity by correcting grammar, refining atomic operation references, and ensuring proper include usage, particularly addressing missing headers for synchronization primitives. Introduced a repository-level .gitignore to maintain repository hygiene and reduce onboarding friction for new contributors. Removed redundant use of std::move in splice operation examples for std::list and std::forward_list, reinforcing best practices in C++. Leveraged skills in C++, version control with Git, and Markdown documentation to deliver targeted improvements that support build reliability and a cleaner contributor experience.