How can I learn more about using the ootb Classes in my templates

Summary:

I want to make a template to apply formatting, such as change the text color, size or background color, to a field in a layout.

Content (required):

Is there documentation that describes the usage of each class and the effect it has?

Version (include the version you are using, if applicable):

23c

Code Snippet (add any code snippets that support your topic, if applicable):