The following is a documentation of the 300+ actions available in the Shortcuts app.
First, browse by the main Categories, or dive into a subcategory to see only a small subset actions.
Plus, check out my custom-tagged sorting for Actions by Types, Difficulty, and Prompt Type.
Make sure to check out Related Shortcuts for each action too.
Some actions are more straightforward, while some take a bit to learn about and implement in your shortcuts.
Browse them depending your current comfort level, then move up a level to see what else is possible next:
Actions generally come in three forms – actions from apps, actions for content, and scripting.
The following categories sort all the actions into these larger buckets, letting you browse depending on your targeted area:
View all the Actions in Shortcuts by how interactive they are when the shortcut is running – will it prompt you, work in the background, or open an app?
These categories are particularly helpful for determining whether a shortcut is good for an automation or Siri, for example: