Internet = it is a net with a lot of devices (computers, mobile, tablets, etc) conected among them, and they can send and receive dates such as text, images, commands, movies, etc.
Laptop = It is a movile personal computer. It is bigger than a notebook and usually more powerful.
Notebook = It is a movile personal computer with a small size and more transportable. Normally they are more expensive than laptop and less powerful.