In addition to the documentation here, there are a variety of other resources available to FRC teams to help understand the Control System and software.
Stuck? Have a question not answered by the documentation? Official Support is provided on these forums:
NI Phone Support
Have a LabVIEW, roboRIO, or Driver Station question? NI provides phone support for FRC teams during the build season at 866-511-6285 1:00-7:00 PM CST Monday - Friday.
Support for Cross The Road Electronics components (Pneumatics Control Module, Power Distribution Panel, Talon SRX, and Voltage Regulator Module) is provided via the e-mail address firstname.lastname@example.org
Found a bug? Let us know by reporting it in the Issues section of the appropriate WPILibSuite project on Github: https://github.com/wpilibsuite