General Working Etiquette? Interpersonal and Communication Skills?

What are some good, general working etiquette that all employees (regardless of the age or local culture) should adhere to?
Eg: Greet / smile at your colleagues when you meet them.

What about some good interpersonal and communication practices that are encouraged to be done at the workplace?

try the golden rule, do unto others as you have them do unto you

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