Details on how to setup and use shortcuts are available here for Parent shortcuts
and here for Global shortcuts
Note that their use depends largely on the project architecture. We usually suggest avoiding heavily relying on global shortcuts as they create dependencies around the code that are hard to keep track of and cause the code to not be the most reusable across projects.
It was recently discussed here: RFE: Make default expression of all new COMPs' Global OP Shortcut be be `me.name` - #9 by lucasm
Best,
Michel