There is a final source for help within your Linux system. Many programs are shipped with additional documentation in other formats: text, PDF, PostScript, HTML, to name a few. Take a look in /usr/share/doc (or /usr/doc on older systems). You'll find a long list of directories, each of which came with a certain application on your system. Searching through this documentation can often reveal some gems that aren't available as man pages or info pages, such as tutorials or additional technical documentation. A quick check reveals there's a lot of reading material available:

$ cd /usr/share/doc
$ find . -type f | wc -l
   7582

Whew! Your homework this evening is to read just half (3791) of those documents. Expect a quiz tomorrow. ;-)