What computer skills do you know? You mention it at the beginning but do not dive deeper into details. If you know PHP, HTML, CSS etc. then it's important to list these under Key Skills, for example. "I have an understanding of PHP, CSS, HTML." Or if it's about different programs, then list them the same way e.g. "I have an understanding of Microsoft Office, Adobe Photoshop etc."

You could even re-write your common sense skill, as it should be assumed the ability to work all office equipment and be left unattended is an indication of common sense.

It's up to you how to word it, but make it look like you're perfectly capable and adaptable. You could use phrases like "I have a good understanding of an office environment by..." But keep it short and sweet, and to the point. Be as succinct as physically possible