Keynote’s rehearsal tools help you to work out the overall timing for your presentation. Rehearsing might highlight parts of the script that don’t work when read aloud.

Similarly, if you want to collaborate using Apple Pages, Numbers, or Keynote online, you’ll need Safari 9.1.3 or later or the latest Google Chrome on your Mac.

With Keynote on your iPhone or iPad, you can use the Keynote Remote feature to link the app to your Mac. (See Apple’s step-by-step instructions here on pairing your devices via the Keynote apps.) ...

Keynote has gained the ability to enlarge slides to a maximum zoom level of 400%. The ability to change font sizes more precisely has also been added. All three apps gain Shortcut support on macOS.