Core java, java 8,database, spring boot,microservice

1. What messaging framework and multiple questions around this, any example for this framework, usage, best case/scenario to use this, authentication mechanism, what are topics and partitions? 2. what is git/bitbucket, and why do we use it how does it work? 3. Cloud Services like AWS, experience if any, what type of service worked on, questions around worked services. 4. Java design patterns, SOLID principles, OOPS concept, and hands-on code for polymorphism. 5. Java-based frameworks , Spring and Quarkus their difference 6. Java test frameworks like JUNIT, mockito