https://docs.spring.io/spring/docs/current/spring-framework-reference/

https://docs.spring.io/spring/docs/current/spring-framework-reference/core.html

https://docs.spring.io/spring-framework/docs/6.0.0/reference/pdf/spring-framework.pdf
https://docs.spring.io/spring-framework/docs/6.0.8/reference/pdf/spring-framework.pdf