This book discusses understanding of chemical bonding which is a principle concept in chemistry. It is a key area in secondary school chemistry and even at higher levels of learning. The book highlights that students in secondary schools have some learning difficulties and lack a proper understanding of structure and chemical bonding concepts, and also clearly provides evidence that learners' attitude towards structure and chemical bonding concepts is positive. It suggests that teachers should try to identify learners' conceptions in their classes in order to correctly assist them acquire scientific knowledge. It enlightens teachers on the difficulties that their learners encounter and as a result, it therefore helps them improve on their teaching approach to the subject matter as well as other related topics. This provides invaluable information for the understanding of student learning difficulties, and insight into how they might be addressed. In general, it generates knowledge and helps improve the practice of teaching of these concepts in schools.