Action

[1:14:35]
✓ Tie a clickable link to a method in a controller
  -- a response to user activity
  -- that doesn't change the URL
✓ Write an action
  -- works with standard HTM elements: links, buttons, forms
  -- `href="#"` – completeness and mobile comatibility
✓ Understand where actions can be located in controllers or route
objects
  -- bubbling