Menu View then tick Advanced Controls.
If you want to take screenshots from the video then click on the Camera button or use the Shift+S shortcut.
If you want to cut some parts of the video then you can use the Record button or use the Shift+R shortcut.
That said, VLC is not an editor. It will be easier and faster to use a dedicated video editor tool such as AviDemux:
http://avidemux.sourceforge.net