Type in another language on your Mac with input sources
You can type in any language that uses the same script or alphabet as the current input source.
Add input sources
> System Preferences, click the preferences of Keyboard
Click Input Sources pane. Then Click the Add button
Then search for a language (such as Chinese, Simplified). If it has an input source (such as Handwriting), select one or more.
After you add an input source, the option to show the Input menu in the menu bar is automatically selected. The Input menu lets you quickly switch input sources as needed.
Input menu :
gives the changes in the menu bar and therefor the access in the avaliable languages as well as character and keyboard viewer,