Emacs: what is the shortcut key to clear buffer?

Question

Like, Control-A (select all) followed by delete?

Answer 1

Select all in Emacs is:

C-x h

(technically, that's mark-whole-buffer) and kill-region (to kill the marked region, which is now the entire buffer) is:

C-w

If you want to delete the region without copying it to the kill-ring, you can use

M-x delete-region

instead. If you do this alot, you'll want to bind delete-region to a key/key combo.