:h visual-mode
	!!! a lot of usefull stuff
:h v_
	Help on all the keys in visual-mode
:h v_b_
	Help on all the keys in visual-block-mode

vit-patter-without-first-v
	use a/i and motion (w, ...) to select inside visual mode
o
	Toggle position of cursor in selection
O
	Switch to the other corner (for Visual-Block mode).
u
	Lowercase selection
U
	Uppercase selection
r<sym>
	Replace the selected text by single symbol <sym>
!<cmd>
	Replace the selection by the <cmd>-results
=
	Indent the selection
~
	Change the case in selection
gq
	Format/Wrap the selected text


						*CTRL-V-alternative* *CTRL-Q*
Since CTRL-V is used to paste, you can't use it to start a blockwise Visual
selection.  You can use CTRL-Q instead.  You can also use CTRL-Q in Insert
mode and Command-line mode to get the old meaning of CTRL-V.  But CTRL-Q
doesn't work for terminals when it's used for control flow.

NOTE: The clipboard support still has a number of bugs.  See |todo|.