Automatically replace certain text with other text or symbols. For example, replace (c) with ©. You could also do this to catch common misspellings like "teh" with "the" or abbreviations like "idk" with I don't know.
To do this:
On your Mac, choose Apple menu > System Preferences, click Keyboard, then click Text.
Click the Add button in the lower left, then type the text to replace (such as teh) in the Replace column, and its replacement (such as the) in the With column.
Tip: You can use iCloud to keep your text replacements up to date on all your devices. Just set up iCloud Drive on your Mac, iOS, and iPadOS devices, and sign in everywhere using the same Apple ID. When you add a text replacement on your Mac, it appears automatically on your other devices (and vice versa).