Always be cordial towards all at work irrespective of the hierarchy.
Maintain your tone of voice at a tolerable decibel level. A loud voice can be extremely annoying in the workplace, and a feeble voice can lead to misinterpretations.
Dress appropriately or adhere to the dress code if prescribed. Let not your clothes distract your workmates.
Practise tact and diplomacy in your words, facial expressions and body language; the way you conduct yourself at the office determines your working potential.
Remember, not everyone shares exactly the same values you do. Adopt a policy of treating people how you’d like to be treated yourself and you should have yourself a smooth work life!