I am new to app development, and I know we can develop apps for iPhone and iPad.
However, I am not sure if I can develop a web app for Apple TV. Can you develop web apps for Apple TV? If so, where can I go to learn about this?
There is no web browser on the Apple TV, so you can't currently develop web applications for a non-jailbroken device. Same goes for native applications.
Jailbroken Apple TVs are another story, but it sounds like that isn't your target here.