Contributed documentation enhancements to the itchyny/go repository, focusing on the Iterator package. The work involved authoring a concrete example that demonstrates how to use map.Keys() within a range-over-func loop, clarifying iterator usage for Go developers. By integrating links to additional learning resources about iterators and range loops in Go, the contribution aimed to streamline onboarding and reduce the risk of misuse. The approach emphasized clear, practical documentation and example-driven learning, leveraging Go programming skills and a disciplined contribution process. No bugs were addressed during this period, with efforts concentrated on improving developer comprehension and documentation quality for iterators.