It is funny how they link out to Salesforce's Trailhead site. Personally, I think it's a cute site for learning, but have also recently come to realize how sometimes it used to have a lot of political content too. One example I can think of is they used to have lessons related to the Fourth Industrial Revolution popularized by Klaus Schwab. At some point, they retired those lessons. My guess is they were retired around the same time that Schwab had some controversial allegations surrounding him.