I’ve flown over a million miles so hopefully this helps. Make sure to check behind you before you throw your seat back when reclining, the overhead bins are shared spaces, if you have a backpack it’s best under the seat in front of you to save room in the overhead. The person in the window seat gets the wall and an arrest, the middle person gets two armrests, the aisle person gets a little extra leg room and an armrest. Treat your flight attendants with respect. Most of all flying is inherently miserable so don’t be a d**k.