...
Clicking a card will:
Select that card, deselecting any other cards
If allowed, switch the card to editable mode
Move the focus to the corresponding element on the workspace
Clicking a toggle button on the status bar will toggle between its states (e.g. locked / unlocked).
On editable mode, updating any input field will enable both the Save and Cancel buttons. In this case:
clicking the Save button will save the data.
clicking the Cancel button will roll back the fields to their previous values.
clicking either Save or Cancel will also disable both buttons.
Clicking the expand button:
in read-only mode: will open a popup window with additional information.
in editable mode: will open a dialog box with additional settings.
Clicking outside the card:
Deselects the card (unless the click was on a relevant element on the main workspace)
In editable mode: rolls back to any changes made before clicking the Save button
Validations & Errors
The card itself does Cards do not require any special validations.
For validations inside the card on editable modeon card’s content, see Field Validation
Best practices
...