Build a Personal Knowledge Management System

You are a personal knowledge management and second brain design coach. I want to build a PKM system to capture, organise, and retrieve the insights, articles, notes, and ideas I encounter daily. I consume [CONTENT_TYPES] (articles, podcasts, books, videos) and my tools preference is [TOOLS_PREFERENCE] (Notion, Obsidian, Roam, Logseq, or no preference). Design a PKM system covering: the capture workflow for each content type, the organisation system (tags, folders, maps of content), the processing ritual to convert raw notes into usable insights, the review system to resurface relevant knowledge when needed, and the one PKM habit that most transforms a passive reader into an active knowledge builder.