need help with linux

[Cliff Steele]

My pc wouldn't start Windows anymore,( it just kept giving me a message that said it appologized that it couldn't start and it would reboot at the xp startup screen), and so I installed red had linux fedora core 4. I can do basic webbrowsing and office applications, but I have no clue how to use the command line to install things like java. Anyone know any tutorials I can use? Or anyone extremely Linux profficient? I have no clue what I'm doing here.