when creating evergreen notes for ideas found elsewhere - translate them into the context of your thinking
I feel like each self-respecting zettelkasten should bootstrap with a bunch of notes on how to take notes 😂. So you'll find a variety of meta evergreen notes throughout the garden 😉
Another level of processing, in a way, is [[apply Spaced Repetition to evergreen notes that you want to remember or periodically rise to attention]]. I've been applying this to first level of processing mostly so far. But this is something that can be developed further, I feel like I haven't discovered it's full potential yet.