It wasn't until the turn of the 20th century that the 3-Act Structure came to prominence, and the divisions can sometimes feel arbitrary, but if you're a screenwriter, you still need to know what's expected in each act so you can include it or creatively subvert expectations.
If you want to learn more about the history of the 3-Act Structure, check out this awesome article by Jennine Lanouette: https://www.screentakes.com/an-evolut...
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Chapters:
0:00 Why Three?
1:36 Act 1
2:33 Act 2
4:54 Act 3
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