There are three kinds of can openers: old-fashioned can openers, manual can openers and electric can openers. Among them, the old can opener put its blade vertically on the edge of the lid of the can, and the blade will be cut off when it is pressed hard. Align the groove of the can opener with the thin protruding edge of the can, and cut it up and down until the lid is cut. Manual can opener: put the can opener on the top of the can. Depending on the can opener, some people need to clamp the teeth of the can opener on the top and bottom of the can, or clamp the teeth of the can opener on the edge of the can, twist the handle and turn the lid around to take it out. And electric can opener: lift the lid of the can with the can opener, the can will rotate and be cut, and the magnet will attract the cut metal can lid and lift the lid.
If there is no bottle opener, you can open it with a metal spoon. Holding a jar in one hand and a metal spoon in the other. Aim the tip of the spoon at the edge of the lid and rub it back and forth at the edge until the tip of the spoon penetrates the lid of the jar.
Then wipe it sideways, and finally pry the lid open with a spoon.