Use a Sentence-Stopping Shortcut

If you’re not already using this trick, you most certainly should, as it can seriously speed up your typing. It is enabled by default, but to confirm it’s active, go to “Settings,” then “General,” then “Keyboard,” then make sure the toggles next to the “Auto-Capitalization” option and the fourth option down — “.” Shortcut — are set to the “On” position.

Now when you’re typing away, a double tap of the space-bar will add a period (or a “full stop” if you’re British!) and automatically capitalize the very next letter you type.