⌘ Command+ C doesnt work and I cant do an "E" by holding ⇧ Shift
Go to System Preferences and click on the keyboard. A panel opens with 5 tabs at the top.  Click on the Keyboard Tab and a new panel appears.

In this panel click on the button at the bottom which says &quot;Modifier Keys&quot;. This brings up a menu on the previous panel. See image below.

you can define what the command key actually is. Make sure the command key is defined as the Command key.