Standard Notes might be the best note-taking app on the market
To make this even more appealing, the Standard Notes UI is very simple to use. One might even call Standard Notes pretty basic in its design. For many users, that simplistic design means the application has a very shallow learning curve. I cannot imagine anyone opening Standard Apps and not immediately feeling right at home with the tool. And because Standard Notes is available to install on Linux, MacOS, Windows, web, Android, and iOS, you can sync your notes to any device you use.
The one caveat to installing on Linux is that you're limited to either an AppImage or a Snap package. I've tried both and found they perform equally as well. However, I do prefer the Snap package as it can be updated without having to download a new AppImage.