WRITE YOUR USERNAME AND PASSWORD DOWN
Maybe a good idea at first, just make sure to hide it where no one can find it other than yourself.
I say 'maybe', because in a work environment, normally the writing of passwords is strictly prohibited & for good reason. Anyone whom finds that piece of paper has full access to the computer & can have a field day, if there's enough time. It's best to go with an easy to remember username (like that of the other OS) & if there's no issue, use the password for that account, or recycle an old phone number (not necessarily yours), being sure to place the # sign after ph, Ph or pH for better security, add dashes between the numbers & add a symbol such as @ or * at the end. Something easy to remember, but next to impossible for another to guess.
In the work environment, have seen co-workers outright terminated over sensitive passwords laying on a desk & rightfully so.
Security begins with users habits & password management is often an overlooked one.