Let it go. They’re going to make really stupid choices. I drank AND smoked in high school. We all go through it. They need to be able to trust you and rely on you. They’re navigating the world and they need a safe harbor. Be that safe harbor. It’s more important than fighting over stupid behavior. Let them know you don’t approve - sure, but fighting over stupid stuff is just going to make you both bitter.
Encourage creativity, science and engineering: Make a craft station / work bench for projects. Fill it with all kinds of art supplies, engineering kits, tools, pegboard, etc. Stock safety equipment like goggles and make sure the area has good lighting. Lots of ideas on Pinterest, etc.
Speaking truth to power is important but should be done carefully. Before you speak remember this: Is there anything self-serving, mean-spirited, or ego-driven? If you’re sure your feedback isn’t tinged with those things, then I’d say you can be comfortable telling it like it is. Note: when you’re young (less than 30) WAIT to be asked before you spill your guts! Always be kind, professional and consider what you want to say carefully.
Let them borrow your calm. Little ones (grownups too) sometimes just need to freak out a bit. Stay there. Be near. Don’t judge or even help. Just be there, and stay calm. Your loving energy is all they need as they work through it themselves. Keep them safe but other than that don’t help or advise unless they ask.
On marriage: Your spouse will change. You will change. Some for the better, some parts for the worse.
Tastes, plans, health, body shape, education, needs, beliefs... all change throughout our lives. It’s growth. (It’s also decay!)
Support each other through both.
Encourage each other to be true to yourselves. Don’t sweat the small stuff. Be kind. Pray for each other. Have fun together. Keep learning about each other. Be your partner’s biggest fan.
Pay attention to what people do and what they say. Try to look past their appearance.
This is especially true for women, who are almost always judged primarily on the way they look.
“A lot” is two words. (You wouldn’t write abunch as one word.)
“Its” is a pronoun like his or hers (you wouldn’t write her’s) The contraction “it’s” ONLY means “it is.”
They’re / there / their