Actually, it is very rare for a Mac to crash, but if it does happen that a program crashes, there is a smart key combination that can help fix the issue. We know under Windows"STRG+ALT+DEL" - the so-called monkey gripIn Apple computers, there is also a key combination for this:

ALT + Command + ESC

The Command key is also known as the "Apple key" by some. Pressing all these keys at once will bring up a small window with all currently running programs. With a simple click, you can now end the program that is causing trouble.