I've memorized the password. it's some words that I won't forget.
Really? Not even if you have an accident, severe head trauma, or suffer from memory loss? 
Notepad from microsoft?
Yes, that's the one. The seed should be written down on paper and stored in different geographical regions. Make sure they are protected from humidity, water, and fire. Other options include engraving the words in stainless steel or creating your own method such as Securing Your Seed Phrase with Washers. Digital mediums are less safe, especially clouds and online platforms. Your seed shouldn't be on a computer that has an active internet connection for maximum security. Only hardware wallets have the means to protect you from some online threats.
