How to shoot knives, guns, swords and bullets in movies? This is not a real bullet, is it?

It's all cut (this needs professionals, but most people can't get it out)

For example, if the knife is inserted into the stomach and comes out from the back, it can be cut. Stop the camera just before it is inserted, and then cut the knife in half. Half of it sticks to the stomach, and usually sticks to the back, which is very similar to the insertion. Very realistic. Sometimes it is directly caught in the liquid pit. A sword and a gun are the same thing. Being hit is just a gesture, followed by a sound (the sound of the gun is in the electronic organ), and then the person who is hit pretends to faint and die, more like stopping a lens in the middle to get some blood or something.