You might like Evernote. It acts like a shelf of notebooks, and you can embed alarms and calendar-linked reminders in your notes. OneNote is similar, but not free.
Like anything, note taking is a habit. Maybe make a list of things you often forget and build an algorithm or standard form that you can append your different calendar entries. You might have a handful of “types” of note lists. These don’t have to be grand: they can be a 3-item checklist, or a template for names and contact info, Then it’s plug and play!
