Is it permissible to utilize books available for publication—for the purpose of learning and extracting academic material—to present a paid course, while citing the sources, without infringing upon the authors' rights?

It is permissible to conduct a language grammar course for a fee, even if the material is compiled from books, because all people benefit from those who preceded them. The financial compensation is in return for the compilation, summarization, preparation, and explanation. It is recommended to mention the source if the material is from a specific book. What is forbidden is infringing on copyright by printing a book or extensively quoting and attributing it to oneself without mentioning the source, for copyrights are legally protected.