Utilities > Notes
Buho is a note-taking application that lets you write the computer equivalent of sticky notes. BUho saves the notes automatically when you exit the program, and they display when you open the program.
Nitrux Latinoamericana S.C. develops it with ❤ and caffeine.
KDE is a community of friendly people who create over 200 apps that run on any Linux desktop and often other platforms too.