Short answer: Yes, go ahead!
Long answer: Yes, go ahead! The online lessons don't correspond to books, as the assessments are now built in to the lesson videos! However, if you're enrolled in a classroom course or Live Online course, you'll want your books handy during class sessions to follow along with, as your instructor will use it for reference. On your own, though, feel free to ditch those books!
*If you enrolled in any of our courses before 2019, you will need to use the books in conjunction with the lessons, following along with them as they provide questions to complete and additional information that correspond with the video lessons.