Basics of using screen

working on a terminal, you want to keep shells open when you leave and have multiple shells open on one terminalconnection. screen is what you want.

man screen

screen  -D -R

this will start screen and immediately bring you to the first terminal. If a screen is already running it will reattach.

ctrl-a c      open
ctrl-a A      assign a name to actual window
ctrl-a k    kill current window

ctrl-a 0    goto window 0
ctrl-a 1    goto window 1
....
ctrl-a '     ask for window to go
    

ctrl-a a   send ctrl-a  = go to first char in line
ctrl-a ESC  scrollback-mode enables you to scroll back up/down using cursors-keys

ctrl-a D D   deattach screen and logout. 
                This will leave screen and all windows running,
                so you can reatach next time

ctrl-a d      deattach screen
                This will leave screen and all windows running,
                so you can reatach next time

i if you want to exit scren, just exit all terminals (typing exit in a bash) and if the last terminal is closed, screen will close too.