The Particle team have helped grow an incredible community. They have detailed guides and programming references on the Particle and their previous microcontroller, the Core. There’s tonnes of resources for you online and lots of people who are actively sharing their projects and prototypes online as well as helping others through the community forums.
If you have questions or you want to do something that isn’t covered in these sets of tutorials, e.g. using a more complicated component, that’s the place to look!