Yes, the topic is interesting, and Jeep really has a rich history. In short, Willys is a legendary SUV from World War II, and the Jeep CJ was a civilian version of the military Willys, produced until 1986. Then more family-friendly models appeared like the Willys Jeep Station Wagon or Jeep Wagoneer, and in recent years the Cherokee, Grand Cherokee, Wrangler and the new Renegade and Avenger have become popular. Each Jeep was created for different purposes: some for off-roading, some for the city or family trips. For easy orientation, I recommend checking out this resource
chart jeep models by year - there is a complete table of all models by year of production, with descriptions and features. This makes it easier to understand which model suits you and see the evolution of Jeep from the 1940s to the present day.