Worked on the AdguardTeam/KnowledgeBase repository to enhance documentation related to CSS injection and element hiding rules for CoreLibs 1.18 and above. Focused on consolidating guidance by providing practical examples, outlining best practices, and clarifying when to use dedicated CSS rules versus element hiding, thereby reducing potential misconfigurations. Improved the rendering quality of documentation by updating syntax highlighting and language specifier usage, ensuring clearer and more accessible technical content. Utilized Markdown and technical writing skills to perform linting and content edits, raising overall documentation quality and supporting smoother onboarding for users and contributors. No bug fixes were addressed during this period.