What are the basic tools of photoshop and what are there uses?

I have photo shop cs4 and don't know what the tools do also if you know any sites that have free tutorials please tell meWhat are the basic tools of photoshop and what are there uses?
for the tools you can easily look for help in photoshop application


press F1





for the tutorial


http://www.tutorialized.com


http://www.tutorialkit.com/


http://www.good-tutorials.com/


http://www.photoshoplady.com/





hope this help


=)