A Zettelkasten is a system-based method for creating a Personal Knowledge Base (Wikipedia) that relies on the use of trunking references.
Make the title directly about the content. Be as clear as possible. If the title doesn’t tell you what is in the Zettel, it is useless. It should inform you and not just grab your attention.
Note: A longer title is fine. It is a title for a note and not for your next bestseller.
The first sentence of a Zettel should be a short description to give you an idea what this Zettel is all about. You should give your future self an abstract. It will thank you because it can decide early if the note is important.
A settle is best thought of as a paragraphic synopsis of a larger piece of information, contained within a single atomic note.
In different software, a zettel would be saved and expressed differently:
Beck Tench uses an icon to denote a zettel when she takes notes using TinderBox.