What Is A Personal Knowledge Companion (PKC)?
A Personal Knowledge Companion (PKC or PK companion) refers to one's central notes app, or "PKM app." It forms the heart of one’s PKM system or second brain.1
Evernote, Notion, Obsidian, and many others are popular apps that can become PKCs. An overview of the PKM app landscape in 2024 can be found here.
For an app to be called a PKC, it must be engaged w…