Just fill ‘em with love. Every other parenting mistake or deficit can be fixed, but if a child grows up thinking it’s not loved and doesn’t have a place in this world, that is a recipe for permanent and painful damage. Not necessarily “spoil” them, but cut them slack as often as possible. Just love ‘em up.
Sex: There's no single way to do it "right" but there are lots of ways to do it wrong. Not being respectful and tender towards your partner is usually at the root of "wrong" ways to do it. Also, there is no rush. You may think all your friends are "doing it." They're not. Take your time.
Never post a pic to social media that you wouldn't want Grandma to see. NEVER send or ask to receive naked pictures.
It's tacky, gross, illegal and not worth it. Even if "everyone does it". It's rude and disrespectful.
If they’re not doing anything dangerous, illegal or immoral, let them be. Give them space and independence. (Just first define dangerous/ illegal/ immoral. Then remind them that you are here and would love to hear about anything they want to share.)
I stopped worrying about you by the time you were seven. (I’m not talking about your safety and health, that I’ll always worry about!) But I knew you were a joyful, generous, kind, smart and well-mannered person. You were a great friend, supportive and fun. You would be a good partner, and would contribute so much good to society. I could see you had a curious mind, an active imagination and more than a healthy dose of courage.