To make it easier to navigate your presentation, you can open a sidebar on the left side of the Keynote window to view thumbnail images of the presentation’s slides, or choose a destination from the View menu. You can also use keyboard shortcuts to navigate through the presentation.
Go to the Keynote app on your Mac.
Open a presentation, click 
in the toolbar, then choose Navigator.
The slide navigator appears on the left side of the current slide.
Click a slide thumbnail to view the slide.
Press the Down Arrow or Up Arrow key on your keyboard to move to the next or previous slide.
You can press keys on your keyboard or use menu commands to navigate in your presentation.
Go to the Keynote app on your Mac.
Open a presentation, then do any of the following:
Move to the next or previous line: With the insertion point in a word or paragraph, press the Down Arrow or Up Arrow key.
Move to the next or previous slide: With the insertion point in a word or paragraph, press the Page Down or Page Up key. If your keyboard doesn’t have these keys, press Fn-Down Arrow or Fn-Up Arrow.
Move to a specific slide: Press Control-Command-G, type the slide number, then press Return or click Go to Slide. You can also choose Slide > Go To > Slide (from the View menu at the top of your screen).
To see all the keyboard shortcuts you can use in Keynote, see Keyboard shortcuts.