If you are using Moodle simply to upload PDFs for your courses, Moodle may not be right for you. Consider using a much simpler web page as Moodle is a large and complex system.
Moodle becomes useful when users interact and create content - whether forum posts, quiz answers, or other actions
I think you need to think about what you want to accomplish for your learners. Technology must be used to enhance your teaching.