Change Keyboard Text preferences on Mac
On your Mac, use the Text pane of Keyboard System Preferences to change options for replacing text, correcting spelling, and using smart quotes and dashes.
To open this pane, choose Apple menu > System Preferences, click Keyboard, then click Text.
Replace list, With list
The Replace list shows words and phrases you want to replace as you type them; the With list shows the replacement words and phrases. To change a word or phrase in either list, click it, then type a new word or phrase. See Replace text and punctuation in documents.
Add , Remove
Add or remove words or phrases from the lists.
Correct spelling automatically
Enable automatic spelling correction in any app that supports it.
You can change the setting for this option in an app by choosing the command from the app’s Edit > Spelling and Grammar menu.
Capitalize words automatically
Enable automatic capitalization correction in any app that supports it. This automatically capitalizes the first word of a sentence and proper nouns (such as, New York or Sonia) as you type.
Add period with double-space
Enable this option to quickly end a sentence with a period and a space by just pressing the Space bar twice.
Touch Bar typing suggestions
By default, spelling is checked automatically by language (useful if you type in different languages). To select the languages that are checked automatically, choose Set Up from the pop-up menu.
To have spelling checked for a specific language, choose the language from the pop-up menu.
Use smart quotes and dashes
Enable typographical quotes and dashes, using the selected styles, in any app that supports them.
You can change the setting for this option in an app by choosing the command from the app’s Edit > Substitutions menu.
If you use Chinese or Japanese input methods, your text replacements are included in your user dictionary. For more information about user dictionaries, choose Help from the Input menu while using one of the Chinese or Japanese input methods.