Adding to this buy extra phone chargers for your work desk, car, suit case, and sofa so most any time you have a charger and cable ready to go.

Find a skateboard deck that you like and hang that up as art.

I would give my teenage self cuticle nail clippers. I wasted so much time with normal nail clippers in my youth

Fire safety, fire prevention, fire fighting. Y’all got the rest covered already. These things were and still are learned the hard way. No reason for us to repeat the experiments with more lives.