i.e. I don't want to try to remember all the peculiarities of a system I implemented or installed or encountered during my life and get stressed about it. So, I write it all down with pointers on the web, or with all the documents I can find and, store it somewhere like Evernote in the relevant notebook with correct tags. When I need to re-use that information I just open the note and look up what I need.
I also take notes while learning something which starts as a simple and single entry point to the all knowledge and resources around it, allowing me to resume or improve much faster with less effort.
OTOH, if I'm going to transfer responsibilities, I make a copy of the notes and hand it over. Rarely any questions come after that, if any.
Lastly, organized knowledge allows me to see what I know and where can I go from there. I find this property immensely useful over the years.