Don't be surprised that there is no documentation. Loads of it is already on the internet ... much more than what I could probably put up at this mini-site .... So, all I am leading you to is the pages or links to those sites ...
Visit them ... sure to pick up something or the other ...
Advanced BASH scripting HOW-TO: A guide to Shell Scripting using BASH (by Mendel Cooper). This is the freshmeat link to the personal home page of the author. Written in a fast flowing style with about a hundred plus sample scripts!
BASH Reference Manual: The Official BASH Reference Manual from the GNU source. A bit geeky, but worth it !
GNU BASH Shell Reference: (google links).
BASH FAQ Page: The FAQ page link on google (obviously cannot be skipped).
bash-doc.html: The BASH documentation distributed by debian. A Feature packed resource (about 244.2 k in size). A Great reference!