How to Get Your Knowledge Out of Your Head

I think a lot of us miss the mark when it comes to getting our knowledge out of our head and there's two different things tasks and to-dos are one of the knowledge is another thing. So I'd be curious whether or not you have any sort of tricks or strategies you use on a regular basis for making sure that the things you learn from others may end up being leveraged in future books. How do you make sure that those things that come along don't get lost? What do you do to save them and know where to find them when the time comes, etc.