Write things down
What did you eat for breakfast yesterday? What was the outcome of the meeting Monday two weeks ago? It's okay to not remember.
But when you really need to remember, the easiest way to go is to write things down. Make a note. Keep a log. Have a list of important tasks. Don't waste your mental capacity to remember trivial things.
Write things down, so your team can easily access that information. When I detect spoken knowledge around me, the first thing I do is to start writing things down.
I might not need it right now, but I will definitely need it in a week, or in a month.
Notes, Google Docs, Confluence: whichever you choose, it's a great choice, because you started persisting informations, and you can share it, too.
Knowledge is valuable, don't throw it away.