Here is some information I put together several years ago to supplement the VEX information, and I look forward to seeing some of the tutorial work being done. https://drive.google.com/file/d/1HLdEjg2xcbALeKR_u67Xit3hBY0AFEE1/view?usp=sharing
As other have said, the small pneumatic cylinders available for VRC teams are a bit limited in use, good for making small actuators and such. Don’t plan on air cylinders lifting your arm and such, unless you’re in VEX-U where there are no limits on pneumatics. You’ll get 6-12 pounds of force from an air cylinder, depending on the pressure you use. Back before V5 and the “pneumatics penalty” a common use on many of our teams was to lock “flip-out” assemblies in place to maintain starting size (second most common was quick-acting claws).