Other simple manipulations

C-o

inserts a newline after the cursor. This has the same effect as RET C-b (return and then back up one character).

C-t

transposes the character under the cursor with the preceding character. If an end-of-line is under the cursor, transposes the preceding two characters.

M-t

transposes the next word that begins left of the cursor with the word following.

C-x C-t

transposes the current and preceding lines.

M-c

capitalizes the next word (making all characters other than the first lower case).

M-u

converts the next word to all upper case.

M-l

converts the next word to all lower case.