Create a system to regularly remind you of lessons you’ve already learned.
Here are three simple ways it’s possible for you to do that.
You could also organize your book’s contents and your notes withan idea index.

If it’s a conversation, interview, or speech, take notes on the important points.
There’s some stuff that’s better left unwritten out of respect for privacy.
Digitize these notes so you’re free to easily search through them in the future.
Jot down any questions or related points that come to mind.
When in doubt, err on the side of collecting more information than you think you will need.
When a point borders on important or unimportant, take notes anyway (here’show to do that well).
It’s easier to discard what you have than to give a shot to conjure a point from memory.
Trylearning shorthandif your writing can’t keep up with someone’s speech.
Make it a priority to do so once every few weeks.
Sharing and discussing information with another person can help you retain it as well.
Trigger Lessons with Mementos
Objects can trigger ideas and memories.
Use this to your advantage and remind yourself ofvaluable lessons and experiences.
Each situation or experience comes with different mementos.
You could enhance this technique by encoding your mementowith a list of memories or a memory palace.
Review the most important pieces ofinformation weekly or bi-weekly.
These could be important lessons or experiences that you oughta prioritize.
Constantly evaluate what questions pop up that it’s possible for you to’t answer.
You could also use objects from firsthand experiences to remind yourself of mistakes to avoid for the future.
A Sample System
Here’s what a system for a book could look like:
Read book.
Make notes in margins and highlight (or mark) segments.
Add calendar entry for four months from now to review book or related information (e.g., negotiating).
If a point resonates with you, print it out and tape it onto your wall.
The system also allows for flexibility.
Collect and organize your information well, review it regularly, and trigger these memories with mementos.
Photos bywatchara,Atovot,Kamilla Oliveira,Beglen, andEmily Bergquist.