A tip to keep in mind when deleting files would be the structure of directories and how they are referenced. For instance, if you are in "/foo" and inside that directory, there is another named "bar" you would run:
rm -Rf ./bar
From foo. The ./ just makes sure you are deleting from your working directory. If at any point, you need to know where you are, run `pwd` to print your working directory.
There are countless times that I ahve seen people mistakenly delete /etc because there was an etc dir inside their current working directory and they typed 'rm -Rf /etc' instead of 'rm -Rf ./etc' or 'rm -Rf etc'.
In short: Be careful. Its hard to un-do that type of mistake. Especially on ext3