cd .. moves you up one level in the file tree
cd /home/knoppix moves you to the /home/knoppix folder
cd /any/path/you/have/ moves you there (if you ave permisions that is).
ls lists the files.
ls -l gives a long list of the files in that directory.
ls -al gives a long list of the files in that directory + shows hidden files
keep asking, best way to learn.
for you it might feel odd that the most powerful tools in linux/unix are on the comandline, sad but true.