People take written notes.
But, wouldn't it be a good idea to take visual notes?
Create a folder on your computer called Visual Notes.
Copy and paste photographs into the folder that:
1) You want to do again.
2) You don't want to do again.
Review your visual notes occasionally before you pick up your camera.
If you print your photographs, you can create a visual notes album.
Get a 3-ring binder and some print pages.