Prioritizing?
Here's a good one. "Will this resolve itself on its own satisfactorily if I don't do anything?"
Some things explicitly won't -- and require preparation, nurturing, followup, and quick action.
Some things do.
And sometimes it can be hard to tell the difference. But with experience, you figure out what can sit for a few days (or weeks) and what can't.
It's a useful heuristic question to ask -- "Will this resolve itself on its own satisfactorily if I don't do anything?"