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the environment Terminal uses by default is BASH. Try looking for bash or unix command line tuturials on the internet.

some basics:
man - typing man followed by a command will give you a manual for that command
ls - list files and folders in current folder
cd - change directory
rm - remove file (can be QUITE dangerous)
mv - move / rename file
host - used to find the ip address of a website
whois - find out who owns a website
 
First of all get a propper title. Help! is crappy as hell and won't get the attention from people who might be able to answer your question.

Second use Google.
 
O'Reilly has a couple of books that would help you become familiar plus they have online tutorials at their website.
 
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