How to switch focus to external display on keyboard shortcut in OS X?

Question

macOS

Good day. There is a Macbook with OS X 10.10 on board and an external monitor. It is necessary to configure all this so that the focus between two full-screen applications open on different screens is switched by pressing any key combination on the keyboard, and not by moving the cursor across the right / left borders of the screen. Those. so that each screen has its own borders, and the transition to working with another screen is carried out exclusively through the keyboard. I ask for advice, hints and even guides. Thanks in advance :)

Answer 1

Command+Tab ?