Checkout my series of two blog posts on Tech buzzwords testers should at least know about: https://blog.testproject.io/2021/07/08/tech-buzzwords-testers-should-at-least-know-about-part-1/ and https://blog.testproject.io/2021/07/29/tech-buzzwords-testers-should-at-least-know-about-2/. With lots of useful links for in-depth learning. Enjoy.
Read all about how to configure your test environment specific data in property files with Spring, to help run your automated TestNG and JUnit tests on any test environment you need: https://blog.testproject.io/2021/02/09/using-spring-to-switch-environments-in-automated-tests/. Enjoy.