Once you are finished with the spring framework and implementation of spring security then you need to switch to spring boot. At that time you will get the best moment of Spring Boot because whatever the configuration you are doing for the spring application will be automated in the spring boot. So you need to learn the following things in spring boot
Importance of Spring Boot
Auto Configuration and Adding Configuration
Properties/YAML
Integration with other libraries/frameworks
REST API
Best way to master Spring Boot
Once you are finished with the spring framework and implementation of spring security then you need to switch to spring boot. At that time you will get the best moment of Spring Boot because whatever the configuration you are doing for the spring application will be automated in the spring boot. So you need to learn the following things in spring boot
Importance of Spring Boot Auto Configuration and Adding Configuration Properties/YAML Integration with other libraries/frameworks REST API Best way to master Spring Boot