There will be two broad types of people: those with interest in fiction, and those who prefer non-fiction. The more you can offer something from each group, and

There will be two broad types of people: those with interest in fiction, and those who prefer non-fiction. The more you can offer something from each group, and from a few different genres / areas in those subgroups, the more people will be able to find their sweet spot. For extra credit, analyze which subjects each person is learning the best from, and give them more of that. Eventually you should be able to find patterns and know when to switch things up by finding each person's learning cadences... romance, romance, chemistry, nature, romance, etc. Out of curiosity I tried chatGPT with a simple: "please give me a list of ten interesting facts about the life of polar bears". It was ok. I got better results with: "can you rewrite that list, providing more unique, novel facts about polar bears? Things most people would not know?"