Worked on improving documentation for the coreos/coreos-assembler repository, focusing on enhancing clarity in the build process for Fedora CoreOS. Addressed a documentation typo in the building-fcos.md file related to the COSA container image age, which helped reduce confusion for users following build instructions. The update was non-functional, targeting only the accuracy and readability of technical guidance. All changes were made in strict alignment with repository standards, ensuring consistency across project documentation. Utilized Markdown for editing and documentation skills to refine onboarding materials, ultimately supporting smoother adoption and usage of COSA by new and existing contributors.