First you need a:
You must PRESS the STOP BUTTON before your bus stop!! Otherwise, you are going to walk back.
Some buses have Wi-Fi
Some buses have USB charger
If you go standing, bend your knees a little bit, specially on starts and breaks and stops.
Some seats can be more uncomfortable than being standing up due to the legs space. Sitting over the bus wheel or next to the heater is not a good idea. (Pro edition)
내릴게요! = I'm going to get down (the bus)
열어 주세요 = Please open (the door)