January 2026 — OI-wiki/OI-wiki: Focused on documentation quality improvements. No new feature deliveries this month; major work centered on a critical bug fix in algorithm guidance. Key achievement: Red-Black Tree deletion description corrected to specify swapping with the minimum node in the right subtree, reducing potential confusion and incorrect implementations. Impact: improves accuracy and reliability of core data-structure tutorials, strengthening learner outcomes and resource trust. Business value: lowers support and revision costs by ensuring precise, up-to-date guidance. Technologies/skills demonstrated: precise technical editing, solid understanding of red-black tree concepts, disciplined Git practices and clear commit messaging.