It's easy to think of Deming as "old fashioned" or irrelevant in the modern world (and yes, some people talk about him like a cult figure), but his ideas are fundamentally practical, enduring, and flexible. The Deming Institute over the last few years has shifted from "preserving Deming's teachings" to "teaching folks how to use Deming in their businesses/organizations now."
I recommend visiting www.deming.org, and also checking out DemingNEXT (https://deming.org/learn/demingnext/). It's a new, unique way to learn Deming online with interactive courses, case studies, "what would you do" scenarios, examples, articles, podcast episodes, and more. (You can get a free 14-day trial to check it out.)
In addition to Dr. Deming's books you can check out The Deming Institute (www.deminginstitute.org). They have a "learn" section with blog posts, podcasts, and articles about the Deming philosophy and how it's being used today. Plus they have sections on some of Deming's main teachings (e.g. the Red Bead Experiment).
I recommend visiting www.deming.org, and also checking out DemingNEXT (https://deming.org/learn/demingnext/). It's a new, unique way to learn Deming online with interactive courses, case studies, "what would you do" scenarios, examples, articles, podcast episodes, and more. (You can get a free 14-day trial to check it out.)
I also recommend watching "why Deming, why now" video here: https://www.youtube.com/watch?v=7zCD2w3u9Ms&t=3s.
Full disclosure - I've worked for The Deming Institute for just over a year now and I've been blown away by how simple but powerful his ideas are.