As others have already written, my go to LC doctor website is DietDoctor. I hand out card with this web address: https://www.dietdoctor.com/low-carb

That intro page covers all the basics, recipes, has his "food revolution" video, hundreds of success stories in four age gender groups, the science of the diet, etc. so offers everything needed to start learning LC...from science studies in print to simple videos.
In the "top low carb basics video" section of that page, they can watch many talks and interviews with Dr Westman (for locals to me we are primarily talking about his clinic program) This same section also has videos with Dr Phinney, Naiman, Fung, etc. If someone is willing to spend the time learning, that one DietDoctor page has everything, with links to more details if wanted, e.g. Why Fat is healthy. https://www.dietdoctor.com/low-carb/fat-your-friend If this extensive one page with all its embedded info still isn't enough, they can email me for favorite books in our library, studies on Keto and cancer, etc.