I am a forgetful person, not gonna lie. I wrote everything down, otherwise I will forget it instantly. Also, keeping a note on what you need to do can free up spaces on your head. I always think of our brain like how a computer RAM (Random Access Memory or just memory, to keep things simple) works. If you memorize things, it will take your “RAM” space (short term memory), and will impact the performance of your brain. The longer you’re trying to memorize, the impact will be bigger.