I like the 3rd of the tutorial videos better. Everyone creating videos seems to torture everyone by starting with the download & install process in excruciating detail.
The videos are great but most people don’t even look for them until they have installed and have become frustrated. So the installation portion can test their already strained patience.
But you can also skip to 17:00 of tutorial two in order to learn how to import the example.gramps into a blank tree. That data is what is used in all the wiki examples. (You can create as many separate trees as you want.)