What is the best attitude an employee should have in order to satisfy their manager, staff, and customers in all areas of work?

Modesty and humility, stay down to earth attitude and effective communication. Use powerful words like thank you, please, we rather I and positive words as much as possible in all your communications. Don't try to impress too much, your personal behavior is very important.

By having a professional attitude, listen them carefully, be helpful, don't be aggressive, communicate clearly and firmly. Don't argue so much and for everything with your manager and always be realistic.