Worked on enhancing technical documentation for krafton-jungle/KJ-DS-BOOK-9-303 and krafton-jungle/KJ-ALGO-BOOK-9-303, focusing on improving onboarding and knowledge sharing. Updated and expanded the hash functions and hash tables sections, refining explanations, table of contents, and closing remarks to improve clarity and consistency. Introduced a new markdown document covering recursion concepts, including definitions, types, comparisons with iteration, and practical C code examples. Emphasized technical writing and documentation skills, using Markdown and C to provide actionable, readable resources. Prioritized practical examples and structured content to support faster contributor ramp-up and ensure comprehensive coverage of algorithms and data structures.