Disable not needed shortcuts
System Preferences -> Keyboard -> Shortcuts tab
Turn dock hiding on/off
turn off all shortcuts defined at mission controls
turn off all shortcuts defined at keyboard
https://www.howtogeek.com/183636/how-the-command-and-option-keys-work-on-a-mac/
The Command key doesn’t do anything on its own. It’s a modifier key you can press to issue keyboard shortcuts to applications. For example, while you press Ctrl+C, Ctrl+X, and Ctrl+V to copy, cut, and paste on Windows, you press Command+C, Command+X, and Command+V to do the same on a Mac.
In summary, on a Mac, you’ll probably be pressing the Command key to issue keyboard shortcuts. The Control (Ctrl) key is also present, but it isn’t used for as many things.
The Option key functions similarly to the AltGr key on many PC keyboards, which explains why it also has “Alt” printed on it. Holding it and pressing another key allows you to type a special character that doesn’t normally appear on the keyboard. For example, pressing Option+4 with the US keyboard layout will produce ¢, the cent sign which normally doesn’t appear on your keyboard. Like other modifier keys, it’s also used as part of some keyboard shortcuts.
Aside from ⌘ representing Command and ⌥ representing Option, ^ represents Control while ⇧ represents the Shift keys
Most applications that I use on a daily basis (such as Google Chrome, Terminal, Mail, and Safari) use ^+⌘+F (Control+Cmd+F) to toggle fullscreen mode.
Unfortunately, not all developers use this shortcut in their applications. iTerm, for example, uses ⌘+Enter to toggle fullscreen mode. If the application you refer to does not use either of these shortcuts, you should look for the fullscreen option in the View menu or by searching for "fullscreen" in the Help menu.
