Important information about Bash is provided in the man pages man sh. More about this topic can be found in the following list:
http://tldp.org/LDP/Bash-Beginners-Guide/html/index.html—Bash Guide for Beginners
http://tldp.org/HOWTO/Bash-Prog-Intro-HOWTO.html—BASH Programming - Introduction HOW-TO
http://tldp.org/LDP/abs/html/index.html—Advanced Bash-Scripting Guide
http://www.grymoire.com/Unix/Sh.html—Sh - the Bourne Shell