I always read about people getting scammed through email or over the phone and I have never figured out how they do it.
This is a great video showing how they do it. They are very sophisticated and they know what they are doing. It is worth watching as it may save you a lot of money!
https://youtu.be/VrKW58MS12g
The YouTuber is Mark Rober who is an engineer who has worked for NASA and Apple.
The good news is that the Youtuber scams the scammers.