There is a lot of information installed by default on your Linux distro. Sure we all know about the "docs" and the "man" pages, but there is more: the command "info" ( They say it is easier to read than the man pages, but don't blame me if you don't agree with that statement <g> )
You can use "info" from the commandline but also, and even easier to navigate, in konqueror thanks to info2html. ( note: konqueror works in Gnome too if properly installed )
So have a look, open konqeror and type "info:/bash" in the address bar . . . you will see that the info-pages give in-depth info about the subject you are looking for. There are links you can click to go to the next level.
If you want to know what subjects are handled by "info" type "info:/info/Top" in the konqueror address bar.
Now I hear you thinking: "Bruno, what's up with you ? We thought you were a command line junkie" . . . . Okay okay, you asked for it:
$ info bash
And you will get the same page as above.
"q" = exit
"n" = next chapter
"p" = previous chapter
"space" = follow link in "* menu"
More info on how to use "info"
$ info info
Sure there are "man" pages about "info" too . . . just try "man info" !!