Nice to know about ls -a, simplified.When you start terminal, your in your home directory, usually
You can type in
Which shows you your Present Working Directory (where you are on the disk)
Then type in
which brings you to the root directory.
When you do an ls there, you will see those directories.
ls -a shows you any files that begin with a "." (period)
Those are more or less hidden.
ls -al shows all files in long format which gives you permissions, owners and file sizes.
don't go touching things though...