Uselful Emacs key combinations
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C-x C-f open file

C-x C-s save file

C-x C-w save as...

C-x C-c quit

C-x g make it stop! (This is the thing to type when emacs is misbehaving somehow.)

C-x u undo

C-x k "kill" (cut from cursor to end of line)

C-x y "yank" (paste most recently cut text)

C-x i insert contents of file into current buffer

C-x 2 split current buffer horizontally

C-x 3 split current buffer vertically

C-x o move to other buffer

C-s find

C-r find in preceding text (backwards find)

M-x shell run shell in emacs
(M-x means Esc x on most computers.)

M-x linum toggle line number mode in current buffer

C-h t emacs tutorial

M-x tetris waste time

M-x doctor psychotherapy