To master Spring Boot you need to learn the Spring framework first. So you must know the basics of the Spring framework at least.
Spring Core
Spring JDBC
Spring REST
Spring Data JPA
Spring AOP
Spring Security
Spring JMS (Kafka, RabbitMQ)
After learning this much of thing you are ready to jump to Spring Boot.
To master Spring Boot you need to learn the Spring framework first. So you must know the basics of the Spring framework at least.
Spring Core Spring JDBC Spring REST Spring Data JPA Spring AOP Spring Security Spring JMS (Kafka, RabbitMQ) After learning this much of thing you are ready to jump to Spring Boot.