MacOS 10.15 Catalina Language Support Articles
Change the language your Mac uses - Apple Support
Check spelling and grammar on Mac - Apple Support
Type in another language on your Mac with input sources - Apple Support
Enter characters with accent marks on Mac - Apple Support
Use the Keyboard Viewer on Mac - Apple Support
Use emoji and symbols on Mac - Apple Support
Specify a keyboard type on Mac - Apple Support
Create and use your own input source on Mac - Apple Support
Chinese and Cantonese Input Method User Guide for Mac - Apple Support
Japanese Input Method User Guide for Mac - Apple Support
Korean (Hangul) Input Method User Guide for Mac - Apple Support
Fonts included with macOS Catalina - Apple Support
Use bidirectional Arabic and Hebrew in Pages, Numbers, and Keynote - Apple Support
Availability of Apple Media Services - Apple Support
Languages supported by VoiceOver - Apple Support
macOS - Feature Availability - Apple