kill-region). See Mark.
kill-ring-save). Some programs call this “copying.”
kill-word). See Words.
backward-kill-word).
backward-kill-sentence).
See Sentences.
kill-sentence).
kill-sexp). See Expressions.
zap-to-char).
Apart from C-k, the most commonly-used kill command is
C-w (kill-region), which kills the text in the region
(i.e., between point and mark). See Mark. If the mark is inactive
when you type C-w, it first reactivates the mark where it was
last set. The mark is deactivated at the end of the command.
The command M-w (kill-ring-save) copies the region into
the kill ring without removing it from the buffer. This is
approximately equivalent to C-w followed by C-/, except
that M-w does not alter the undo history.
Emacs also provides commands to kill specific syntactic units: words, with M-<DEL> and M-d (see Words); balanced expressions, with C-M-k (see Expressions); and sentences, with C-x <DEL> and M-k (see Sentences).
The command M-z (zap-to-char) combines killing with
searching: it reads a character and kills from point up to (and
including) the next occurrence of that character in the buffer. A
numeric argument acts as a repeat count; a negative argument means to
search backward and kill text before point.