It's easy to determine if your site is level for a carport or a garage. WIth four stakes, string, and a line or string level, you can determine this easily.
The title literally reads: "How to ensure your site is level for a carport or garage" - and the video walks you through the processes involved in accomplishing exactly that. Likewise, you can use the search bar to look up videos explaining "How to Level a Site for a Carport or Garage" and find the video relevant to your specific needs instead of complaining in the comment section. Time is only wasted if you use it to complain in the comment section, dude...