Something I wish I had done more. You think you don't need to make a note because it's fresh in your head at the time, but years later, even the context is gone. Expecting to remember arcane solutions to things you do rarely is unrealistic. I've gotten better but still have a ways to go. One thing that removes the barrier is to just have common log to put everything, perhaps with some tags, so you can quickly open it and type your thoughts when they're fresh, without having to worry about packaging it just right.