In the 2nd video, the presenter chooses the Place command from the File menu. (00:16) Navigate to where you downloaded the Assets folder for the tutorial. Hold the shift key to select all the assets (graphics) numbered 01-06 at once. This is similar to having a "loaded gun" that you can click to place all graphics sequentially in various locations on both pages of the brochure.
I hope this helps! Please let me know if you need further assistance.