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Quickly end a sentence with a full stop

macOS Mojave includes a shortcut for ending a sentence with a full stop by just pressing the space bar twice. This means that hitting the spacebar twice will insert a period and a space automatically at the end of a sentence (or a word).

Automatically typing periods comes to the Mac from the iPhone and iPad world. To enable this feature:

• Go to the  Apple menu and choose "System Preferences"
• Select the “Keyboard” preference panel, then choose the “Text” tab
• Locate the setting for “Add full stop with double-space” and toggle the checkbox to the "On" position
• Exit System Preferences

Now when you hit the space bar twice, a period and a space will be inserted automatically.