show all visible characters like spaces, tabs, linebreaks / hide all visible characters

Enable syntax-highlighting / Disable syntax-highlighting

Enabling current row and column highlighting

Enabling relative line numbering (cursor is always at zero)

Indentation in vi

you want to mark something in visual mode, and indent the selected part several times to the left or the right?
First you add these lines to your .vimrc

Now you can visually select a text-passage (press v move the arrow keys), afterwards indent it to the left by pressing < or indent it to the right by pressing >