Which of these are online learning resources that usually accompany textbooks?

Supplementary readings are often included as online learning resources that accompany textbooks to enhance students' understanding of the course material. These readings can provide additional context, updated information, or alternative perspectives that complement the main textbook content. By accessing supplementary readings online, students have the opportunity to deepen their knowledge and engage with the subject matter more effectively. This resource is particularly valuable because it can include articles, research papers, case studies, or curated content that aligns with the textbook, helping to enrich the learning experience and support diverse learning styles.