Select File or Folder. Hit Command-Delete.
Every Mac user knows that you drag files or folders you want to delete to the Trash icon in the Dock. And you probably even know that you can select multiple items by Shift-clicking (for a sequential range of items in a list view) or Command-clicking (for an arbitrary set of items) and then drag them to the Trash. But you’ll save yourself mousing time if you learn the quick shortcut that trashes selected files and folders: Command-Delete.