Use the keyboard to navigate the ribbon - Use the access keys

 To use Backstage view, open the file page (Alt + F)

To use themes, colors, and effects, such as page borders, open the Design tab (Alt +G)

To use Common formatting commands, paragraph styles, or to use the Find tool, open Home tab (Alt +H)

To manage mail merge tasks, or to work with envelopes and labels, open Mailings tab (Alt + M)

To insert tables, pictures and shapes, headers, or text, boxes, open insert tab (Alt +N)

To work with page margins, page orientation, indentation, and spacing, open layout tab  (Alt + P)

To type a search term for help content, open (Tell me) box on ribbon  (Alt + Q, then enter the search term)

To use Spell Check, Set proofing languages , or to track and review changes to your document, open the review tab.  (Alt + R)

To add a table of contents, footnotes, or a table of citation, open the references tab  (Alt + S)

To choose a document view or mode, such as Read Modeor Outline view, open the view tab. You can also set Zoom magnification and manage multiple windows of documents  (Alt + W)