I understand that you have to register a domain name, and you have to choose .net or .com, etc. Well, I would like to be hosted rather than own my own website, so when I register my name, does it matter whether i chose .net/.com/etc.? When you register a domain name, don't you get some kind of package to own your website for a year or whatever the site offers you?

Also, what exactly is PHP,CGI, and MYSQL?

But in the mean time, I am going to do some research on google. Thanks in advance.