In the video, I explain that the literal meaning of ‘to get on’ is like ‘monter’ in French – so ‘je monte dans le bus’ would be ‘I get on the bus’. Be careful, though, because it isn’t always the right translation for ‘monter’.
In English, we get on a bus, a train, a plane and a boat. But we get in a car, a taxi. Please don’t ask me why, there are linguistic explanations, but I don’t think it’s useful to analyse them, just learn them as they are!