to admit you don’t know… customer service. not being an asshole.

Well said, I cannot stress not being an asshole enough :)

• No politics,
• No making fun of people/things/history.
• You've got that great story about your uncle and a cdrom cupholder, nope.
• Treat all people respectfully, don't interrupt.
• Limited dad jokes. One or two can be a party, 3+ and they're wondering if they want to work with you
• you are not required to disclose family, disability, age, you might choose to say that you have kids in an attempt to project stability and longevity, that's a decision only you can make.
• Look up Dunning–Kruger in case they talk about it with you being fresh into the scene. (The Dunning–Kruger effect is a cognitive bias[2] in which people with limited competence in a particular domain overestimate their abilities.)

Do: (at the end if they ask for any questions)

• Ask questions about the company culture
• Ask questions about your coworkers. (tell me about your team)
• Ask questions about the craziest thing they've ever seen.
• Engage them, get them talking about the things they like.