I have one massive text file (well, actually an Apple Note) where I paste anything I need to reference throughout the day. Reverse chronological, newest stuff on top. If I need something later, it'll be in there. If the information is sufficiently important, it'll eventually move into another more focused document.
All of the above. I throw everything in that one file to keep it simple and prevent myself from spending unnecessary time organizing information that I don't end up needing again in the future.
I suppose the exception is when I already have a project-specific doc set up, then links or thoughts related to that project will go in there. But even then, sometimes I use the default scratchpad first, and move the info later, the next time I'm doing dedicated work on that project.
Is this just links or also ideas, connections etc?