If you want to watch a movie, but it's in the middle or the end of a franchise or trilogy, do you need to watch the others first in order?

Or does it not matter and you choose what you want to watch?
Update: i'm asking for more of your personal habits. not just storyline order or franchise order. if YOU want to watch a certain movie that's a trilogy or franchise, do YOU need to watch the ones that came before it.
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