The “Shortcuts” section here is for automating Agenda with the “Shortcuts” app on iOS. I assume that is what you want, not keyboard shortcuts.
If that is what you mean, the best place to start building them is this page: X-callback-url Support and Reference
It tells you what you can do with the x-callback-urls, which you can use with Shortcuts.
Others also post their shortcuts in this section, so looking through might give some good starting points.
Kind regards,
Drew