A fleeting note -- inbox. Ideas sketched on a back of a napkin, in the note-taking app on the phone.

• Bibliography -- ideas, citations, sources. Not mine, they are a reference point for future research.
• Zettelkasten -- my ideas that are born on top of someone else's ideas, integrated into a personal context, compared to existing background and experience.
• Digital garden -- ideas that to my inner eye might take wing and sprayed by ideas from other gardens.

Why it is important to keep notes separated? It creates a certain ever-ascending cycle of development. Idea rises in a spiral trajectory and grows.

UPD: 220821 Additional thought, that support my opinion, stated by Alexey in his garden though his idea is related to GTD, but the concept remains no matter what.