The files you find in this location deal with the most common
problems. They don't cover all topics or all details.

Since you are using a Unix system it is essential that you make
yourself familiar at least with the most important Unix commands.
Now a days you can get a lot of good books for Unix beginners 
(eg "Unix for Dummies" - this is not an insult but a real title and 
that book is very good for beginners).

Unix itself has also an own help system, the so called "man" pages (manual
pages). If you are looking for a command or the options for a command try

man the-command-you-are-looking-for

eg.

man ls

will give you a description and all options for the command 'ls'