The first one was pretty good. I found it helpful, although at that point I didn't know much about it at all so most anything would be helpful. Even so I liked it and enjoyed it and I learned from it so that was good.
The second video was fairly helpful to me as well, so I don't know which of the first two was more useful so I'll call it a tie. I liked the picture they edited better in the second one.
The third video was very, very long and I watched it kind of late at night but it was somewhat boring so I don't really remember it that much. So all I can say about that one is that it was really long and I thought that having a picture of three rocks stacked on top of each other next to a globe was somewhat strange, but whatever that doesn't really matter probably.