You might as well write them on a poster outside your house, it would be the same.
I take this post to inform people that there are easy to use, secure and free tools to properly manage your passwords for all of the online services you use. The one I highly recommend is KeePassXC.
With this tool, not only will it be easier for you to centralize the management of your passwords in a secure way, but it also integrates well with most Internet browsers such as Google Chrome, Firefox and Microsoft Edge.
Read this KeePassXC guide to learn more!