Help with ‘emacs-lisp-mode’

‘DEL’ (backward-delete-char-untabify)
  Delete characters backward, changing tabs into spaces.

‘C-M-q’ (indent-pp-sexp)
  Indent each line of the list starting just after point, or prettyprint it.

‘C-M-x’ (eval-defun)
  Evaluate the top-level form containing point, or after point.

‘C-M-i’ (completion-at-point)
  Perform completion on the text around point.