How do artificial satellites fly directly? Please tell me what the principle is

In terms of earth satellites, after the rocket launches the satellite, the rocket uses a certain speed to push the satellite on a predetermined route around the earth, which is the so-called orbit. After completing this task, the rocket separates from the satellite. , after the rocket decelerates, the centrifugal force decreases, and under the action of the earth's gravity, it falls towards the earth. Since the satellite is already in the space orbit, there is no air and no resistance. If there is no other force to control the satellite at this time, At this time, the satellite will keep flying forward, flying towards the boundless universe, and the satellite will run away and be lost. Fortunately, the earth has a gravity. If the satellite runs forward, the gravity will pull it down. If the speed of running forward is too slow, , the satellite will be pulled back to the earth by gravity. If the speed is too fast, the satellite will fly away and fly to the boundless universe. Only when these two forces reach a certain balanced relationship, the satellite will keep flying around the earth. ,,,,