Bitcoin wallet passwords are very big and they can't easily be memorized and this is the reason we need to store the bitcoin password in a safe place. I  usually advice all my friends and other relatives who are active bitcoin traders to store their passwords in safe place something like Cloud-based websites, Google Drive, External Hard-Drives, Laptops, Mobiles and in my storeroom so that i don't forget it. I personally use all this method and i you all to follow any of these methods.