I'm not asking this to be snark, but because I am still not seeing a major difference. For example, take a math textbook. Generally they are broken into subjec

I'm not asking this to be snark, but because I am still not seeing a major difference. For example, take a math textbook. Generally they are broken into subjects (eg circles) and then that topic is broken into lessons (eg circumference or area). Each lesson provides tactics & formulas for solving problems, examples of applying them, and a problem set to practice with. In my experience this is basically what a teacher would present in the classroom, with the exception of their samples being more interactive, and teachers having the ability answer questions. Were you thinking of another type of textbook? I can see how this may be different for history or literature textbooks, but to me that just means that said textbooks are doing a poorer job of covering everything they should. I think a textbook shouldn't just cover content, it should facilitate learning the content.