I really want to dive into learning as much as I can about World War 2, and hopefully this interest will later spark me to learn more about the rest of the 20th century.

Where do I begin? I don't want anything to comprehensive that I'll immediately lose motivation. I kind of need something which gives me a short summary to start out with, giving me the building blocks and motivation to delve further. Documentaries/short YouTube videos/short books for dummies etc. are all welcome

Look forward to your response!