If you are working in an office with a phone and/or computer, keep them on mute: It is a simple, but important office courtesy rule. If your computer or phone make a noise every time you receive a message, it’s going to be distracting for co-workers.
Instructions are often disguised as polite requests: In order to be polite, requests, suggestions, and commands are often phrased as questions. When receiving such a request from your manager, the expectation is that you will comply.