To do this

Select the active tab of the Ribbon and activate the access keys. Alt or F10. Press either of these keys again to move back to the document and cancel the access keys.

Move to another tab of the Ribbon. F10 to select the active tab, and then Left Arrow or Right Arrow

Expand or collapse the Ribbon. Ctrl+F1

Display the shortcut menu for the selected item. Shift+F10

Move the focus to select each of the following areas of the window: Active tab of the Ribbon

Any open task panes

Status bar at the bottom of the window

Your document F6

Move the focus to each command on the Ribbon, forward or backward, respectively. Tab or Shift+Tab

Move down, up, left, or right, respectively, among the items on the Ribbon. Down Arrow, Up Arrow, Left Arrow, or Right Arrow

Activate the selected command or control on the Ribbon. Spacebar or Enter

Open the selected menu or gallery on the Ribbon. Spacebar or Enter

Activate a command or control on the Ribbon so you can modify a value. Enter

Finish modifying a value in a control on the Ribbon, and move focus back to the document. Enter