Firewall protects your computer from malicious attacks by controlling what goes in and out of the network.
Computer files can be organized by putting them in folders that are named appropriately to categorize them. For example I put all my pictures in a folder called 'My Pictures'. This way I can easily find my picture files on my computer.
In Excel you can make tables and then when you are done with them you can organize them, then if you will, you can make it colorful.