To create a screen

screen

List all the detached (running) screens with their screen IDs.

screen -list

Connect / Attach to a specific running screen.

screen -x [screen id]

While in a screen to Terminate / Stop a screen from running.

Ctrl + D

While in a screen to detach from screen without disturbing it.

Ctrl + A, Then press D

Detach or terminate all screens.

killall screen