Fitbit Developers oversee the SDK and API forums. We're here to answer questions about Fitbit developer tools, assist with projects, and make sure your voice is heard by the development team.
The Fitbit SDK uses JavaScript. There are lots of resources and training courses available for free online, such as:
Once you're familar with JavaScript you can follow the getting started guide on dev.fitbit.com
https://dev.fitbit.com/getting-started/
and check out our open source example projects:
https://github.com/fitbit/ossapps