The current state of Exponent Documentation is not where we'd like it to be. However, we're making a strong effort to bring documentation up to speed with a great system that makes it effortless for administrators to find the information they are looking for very quickly, directly through their Exponent Website's interface. What's more...the help/documentation site is actually a simple ExponentCMS site with a customized theme.
Exponent Documentation Website
The online help and documentation site contains a wealth of information about Exponent CMS. It can be accessed from within Exponent, in most areas with a context sensitive link to an appropriate help topic. docs.exponentcms.org
Exponent API Documentation
For detailed API documentation of interest to developers, you can visit api.exponentcms.org.