You could check out our 5E SRD action collection on our Knowledgebase, it’s got all SRD spells and class feats for 5E in an Astral friendly format:
You could also check our examples provided in our Syntax section of the Knowledgebase:
Each of those sections have examples of common actions.
Finally, I’d strongly recommend going through the Tutorial Games. We’ve recently updated the Advanced Tutorial Game with a map specifically for character building and actions. You’re guided through an interactive tutorial which covers creating actions, advanced math and checkboxes for real-world situations like calculating max health automatically, or creating checkboxes that alter your stats and output.
Hope this helps!