I found this guide to manners and found it interesting. I have bad habits of giving unsolicited advice and also talking about minutiae all the time.
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You are forbidden from publicly humiliating anyone. In fact, so long as others are trying in good faith to interact respectfully, you are obligated to help them save face in embarrassing social situations.

You may not ask invasive personal questions. Other people’s age, weight, and illnesses are not your business unless and until they choose to make them so. Nor are their intimate relationships or reproductive plans.

You may not offer unsolicited advice. Presume that other people are competently managing their own lives as they see fit. If they want your thoughts on their relationships, finances, or dietary habits, they will ask.

You may not criticize other people’s appearances, except to alert them to smudged lipstick, open zippers, or other accidents fixable in a quick run to the restroom. This prohibition includes backhanded compliments to the effect of, “You look so much better like this!”

You may not annoy acquaintances with your personal minutiae. You may be warmly cordial with co-workers, service personnel, fellow PTA members, or others whose unavoidable commitments have brought them into contact with you. They are unlikely to be fascinated by completely off-mission details of your existence, such as your workout regimen, diet, political opinions, or the dream you had last night. Minimize the risk of boring or offending them.