The help tool allows you to search man pages, info pages, and plain text doc files (or any subset of these) for a regular expression. Search hits are listed and you can double click on them to view them. This tool is very basic, and should see drastic improvement over time.
The HOWTO rpp contains many, many useful documents. It installs help files under /usr/doc. If you have a question, it is probably answered in one of those documents. Additional help and information is availble using the man and info programs.