Obsidian is a note-taking app that focuses on linking ideas together. If you want to create a personal knowledge base, this tool gives you the flexibility to do it. Here is why: Obsidian stores notes in local Markdown files. You own your data, and you can access it with or without an internet connection. Let’s break it down. The core feature is backlinks—connecting notes to each other like a web of ideas. Over time, this builds a second brain where concepts are linked naturally. The app also offers a graph view, showing connections visually. Plugins add more power, from task tracking to publishing notes online. Next steps: Start by writing three notes and linking them together with internal links. Check the graph view to see how your knowledge base begins to take shape. Takeaway: Obsidian is perfect for people who want to go beyond simple note-taking and build a connected system of knowledge.