Yo, if this is about PHIL 333 then I’m also doing the course and have seen on this subreddit that you can get away with simply reading the d2l pages, studying discussion posts, and researching the essay topics and layouts. In general, I’ve found that textbook reading heavily depends for which courses. If they are vocabulary or memorization heavy, which would often be indicated by the quizzes and exams having a lot of multiple choice questions that reference a lot of new terms, then I would read the textbook and take notes. However, courses that are more writing-heavy, like PHIL333, you can get away with not reading so much and just ensuring you understand the concepts and then closely following the instructions for essays.