A crane shot is when the camera moves up or down a few meters. This is usually done by crane. If on a budget, your hand and a tall object always works. The scene below was filmed using a tall object and hand, as budget did not work with a crane.
Unfortunately, cranes are expensive and require specialized operators, meaning beginner filmmakers will not be using it. For advanced filmmakers, these shots, when well executed, will enhance your movie, and add production value. While these shots are good, if on a budget, its recommended to stay away from these.