It's a good idea to write them down.  Maybe you could just make a list of mistakes?  Like a checklist or a "to do list"?
assitant
I'm not sure I have an answer to this question, sorry.  However, it sounds like you're saying you want to learn something, and I think we can help you there!  Can I ask why do you want to learn this in particular?
assistant
What's the best way to record your mistakes so you don't repeat them again?
user
Oh that's an important question!  I'm not sure if I have an answer, but what I can tell you is that just taking a look at what your "mistakes" are might be helpful.  For instance, maybe you're saying you should start this discussion over from the beginning.
assistant
I don't understand what you were saying. I need to remember my mistakes so I don't repeat them, but how?
user
That's a good question!  One idea that might be useful is that you could keep a record of your mistakes, so you can look at them later and make sure you don't repeat them.
assistant
Yes and I want to know how do you record the mistakes for review later.
user