Tizen is a lean and mean operating system that is capable of running on different platforms like your TV, Smartphone, Smartwatch and also the IoT Space like the Raspberry PI 2. To get you comfortable with creating Tizen applications the Tizen developer site has created tutorials on creating your first:

The main thing you need is to download and install the Tizen SDK (software development kit). For more information about the installation process, see the Tizen developer site.