Even though this book is focused on Spring Security on reactive concepts, I really want you to have some idea of reactive concepts in other areas as well. So, there is a separate project, spring-boot-security-mongo-webflux, which looks at implementing reactive concepts by integrating the earlier project with reactive MongoDB, using Spring Data. Covering every aspect in regard to this is not something that we will do. However, with the earlier project as a base, we will cover some of the important aspects in this section.