Will not be putting any tutorial here, as there are many such pages out on Google. You can get better understanding from there.
​Will be putting certain issues & there solutions I used & will paste some working examples which you can use to browse through other options available.

Introduction to Spring Method Security | Baeldung

​How To Implement Fault Tolerance In Microservices Using Resilience4j? | Making Java Easy To Learn (javatechonline.com)


​How To Implement Hystrix Circuit Breaker In Microservices Application? | Making Java Easy To Learn (javatechonline.com)

Transaction Propagation and Isolation in Spring @Transactional | Baeldung

 Anyone looking to get a quick working overview about SpringBoot application then surely check below video-

To analyze  improve the performance of Data persistence layer in the application check - Hypersistence Optimizer