How Do I Learn Internet Of Things(IOT) Programming?

first of all, IoT is not programming. Its a protocol or a type of communication to connect devices. In order to implement IoT in your application, you must first select a Controller/Processor which supports Ethernet functionality. Then select an Ethernet device and interface it with Microcontroller. Build your own webpage and deploy it on your controller. There are many ways of doing it. You can develop it as a web server in which your controller will host your webpage or you can also build a client-server application