Best practices
Help people predict the results of undo and redo as much as possible.
Show the results of an undo or redo.
Let people undo multiple times.
Consider giving people the option to revert multiple changes at once.
Provide undo and redo buttons only when necessary.
Platform considerations
iOS, iPadOS
Avoid redefining standard gestures for undo and redo.
Briefly and precisely describe the operation to be undone or redone.
macOS
Place undo and redo commands in the Edit menu and support the standard keyboard shortcuts.
For the complete guidance, including worked examples and illustrations, see the canonical page: https://developer.apple.com/design/human-interface-guidelines/undo-and-redo