Notions
A question, rough idea or useful connection can go here before it turns into something larger—or disappears completely.
Methods worth keeping
Calculations, references and repeatable procedures belong somewhere more durable than a scrap of paper beside the oscilloscope. Whether future me can find them is a separate experiment.
Useful fragments
A short note can keep the part that matters without inventing a larger story around it. Sometimes one setting, measurement or awkward little fix is enough.