Now you can create user accounts. You can create an account with separate password for each member of your family or your workgroup. It's easy to get lost in the large tree structure of the filesystem, but it's also easy to find out where you are and move to where you want to be. In Linux, as in Unix, you can always go home by typing 'cd', the Change Directory command. This is a slightly different behaviour than the cd command in DOS, where 'cd' without a qualifier is equivalent to the Linux 'pwd'.
Relative movement is built in.
Try these cd commands on your system. The basic Linux command for looking around at files and directories is 'ls', which means List. Its counterpart in DOS is 'dir'. The ls command has several flags, or qualifiers, you can use to alter the amount and type of information displayed. You can read up on the options by typing 'man ls'.