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Ctrl-a + c: creates a new screen
Ctrl-a + N: (where N is equal to the number of the screen) this key command switch us to a specific screen
Ctrl-a + a: switches us to the next screen
Ctrl-a + w: view a list of screens. The unique ID of each screen, along with its name, and running process is displayed, for each individual window. The current window will be marked with an asterisk (*).
Ctrl-a + “: allows us to view the screen picker
Ctrl-a + ? - shows the shortcut key options
Ctrl-a + p and Ctrl-a + n: used to switch to the next or previous window.
Ctrl-a + k sequence : will kill the current window session. We can also type 'exit' to kill the current window. If no other screen sessions are open, screen will simply exits. The 'C-a \' key sequence also accomplishes the same task.
Ctrl-a + d: detaches the from to detach the current screen session.
Ctrl-a + r: to reattach a detached screen session.