Crtl Alt Del (hold all keys down). Shutdown from the option shown on top of dialog box displayed. Might take a while if a program has crashed. You might also get other boxes shown stating some programs need to close.
or
Keep unplugged from mains until battery runs down.
mike11111 – at the risk of appearing rude, I assume that you have very fair coloured hair.
Pulling the mains plug from a laptop will result in it running on battery (the laptop may remain on for many hours depending of the state of the battery) – a bit of a pain every time you want to shut down the laptop.
Most laptops have a reset button, normally operated via a small pin poked through the enclosure aperture on the base or side of the machine.