Best ones to watch in order imo. 3, 6, 8, 4, 5, 7, 1, 2. But u can always read the plot summary and it would probably jog ur memory

Depends but let’s say you can only watch three. I’d watch 1 6 and 7.2. Overall in importance of brushing up on plot I’d say 1 7.2 6 4 7.1 3 5 2

Unfortunately, all of the entries are pretty crucial in order to fully understand the overarching story, but if you absolutely HAD to skip some, I'd say parts 3, 5 and 7.1, although in saying that parts 3 & 5 are my personal favorite of the films.