Keep A List of Things I Don't Know

Richard Feymann, famous physicist, kept a notebook with the title "Things I Don't Know".

I keep a similar "Task List" for myself. If some technology starts appearing everywhere or something grabs my attention, but I don't have the time to research it, I put it on this task list.

When I start my research, I keep some notes together, although not on paper, so I can use as reference in the future.