A good idea disappears faster than you'd think.
You hear something useful. You get it. It feels important. You tell yourself you'll remember.
A few days later it's gone. Not because the idea was weak. Because you gave it nowhere to live.
I learned that the hard way. A few years ago I assumed I'd remember every good idea I had.
I didn't.
So I started writing things down. Messy at first. Ideas. Things students said. Mistakes I'd made. Questions I couldn't answer.
Years later some of those notes turned into books. Some turned into lessons. Some turned into solutions to problems I hadn't hit yet.
That changed what notes are to me. They stopped being reminders. They're a conversation with whoever I'm going to be later.
A student once told me he'd spent hours watching educational videos. I asked what he'd learned.
He paused. "I don't know."
We all do it. Videos. Podcasts. Articles. Almost none of it stays. Not because the information is bad. Because we never gave it somewhere to live.
Learning doesn't happen when you hear something useful. It happens when you stop long enough to think about it.
Write it down. Question it. Come back to it later.
I trust my memory less than I used to. Memory fades. Good notes don't.
Some ideas are useless today and exactly what you need in two years.
You'll be glad it's there.