How to delete Files and Folders in Ubuntu

Even though how many times I have used some commands in Ubuntu, I just forget them sometimes.
The command rm is used to 'remove' stuff.

Here is how you would remove a file
sudo rm /media/disk/file.extension

Here is how you would remove a directory

sudo rm -rf /media/disk/directory

-r: recursive
So, all the directories and their contents inside the directory you mentioned will be recursively deleted.

-f: force
It will never prompt you for anything