@SpringBootApplication

This annotation is a convenience annotation that combines several annotations to configure a Spring Boot application.

Here's how the @SpringBootApplication annotation works:

@SpringBootConfiguration: This annotation is a specialized form of @Configuration that is used to mark a class as a configuration class for the application.
@EnableAutoConfiguration: This annotation enables Spring Boot's auto-configuration mechanism. It automatically configures the application based on the dependencies in the classpath.
@ComponentScan: This annotation tells Spring to scan and discover beans (components, services, and configurations) in the specified packages. If not specified, it will scan the package where the main application class is located.
@SpringBootConfiguration, @EnableAutoConfiguration, and @ComponentScan together make up the core of the @SpringBootApplication annotation.
@EnableJpaRepositories: Also exists which you can put where are your JPA repository classes in case they are in another package

@SpringBootApplication
public class MySpringBootApplication {
    public static void main(String[] args) {
        SpringApplication.run(MySpringBootApplication.class, args);
    }
}