Arrive five minutes early, not twenty. Too early puts the team on the spot; too late looks careless.
Offer a measured handshake, smile, and say your first name clearly. Put the phone away before you enter the room or join the call.
Listen to the question until the end. One second of silence before you answer is better than a cut-off or rambling reply.
Speak in facts: a situation, your action, the result. Do not badmouth a former employer or colleague.
At the end, say thank you. A short question about the team or the role shows you are already thinking about the work, not only the performance.