Start notes with context

When writing permanent zettelkasten-style notes, begin with a sentence or two defining how this concept fits into the world (a note expresses a concept). You'll notice most pages on wikipedia doing the same.

This habit gets you to contextualise the information you're writing about, and understanding requires ideas to have context. This comes back to help even further when you revisit your note later - context will help you access the associations you need to think about the subject clearly.

Lastly, adding context in this way gives lots of opportunities to link to other related concepts - and your notes should be densely linked