How To Use Keyboard Accessibility Features On Your Mac
In System Preferences there are several keyboard-related accessibility features that can be useful for anyone. You can set modifier keys to remain active so you can use keyboard shortcuts without needing to hold down multiple keys at the same time. You can enable typing sounds and a slight delay to prevent keyboard errors. You can also bring up an on-screen keyboard to use if you are having hardware issues.
Access to the Keyboard Viewer (access to special characters). At Finder-press these 3 keys Control+Command+Space