How to understand how to download video from youtube?

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ssrdop2018-01-30 23:47:57

YouTube

ssrdop, 2018-01-30 23:47:57

There was a desire to write a script that downloads a video from YouTube using a link.
After googling, people suggest using a curl using a link like " https://www.youtube.com/get_video_info?video_id=$v... with the replacement of id video.
This is understandable. I don't understand how they got to this? Do you need to follow this link? How did you come to this? That is, if you went to the developer tool in the "Network" tab, found this information? Or in another way?
What if you need to download a video from another service? In what direction should you always look?

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Dimonchik, 2018-01-30
@dimonchik2013

so search, yes, through Chrome + F12
browser - to lose - you have to download
nothing complicated