From the site:
Step 1 - Find a place: We start by preparing your spatial memory. To do this, you need to choose an actual place or building that you’re very familiar with. This could be your home, work, school, or any place that you can close your eyes and imagine or "see" in detail ...
This site looks to be based on the same techniques (Memory Palace AKA Method of Loci) that are described in the book.