What are the principles which make Spring beneficial

I don't get the benefit of using Spring instead of just using regular Java EE, and I think the reason is I don't have a good grasp of some of benefits of the design principals that Spring employs (dependency injections, etc.)

For example I don't understand what benefits we get by adding @Bean, @Component @Autowired and @Repository annotations.

My question is not what do those annotations do, the question is more what are the principals that Spring make the implementation of which easier or more effective?