Adding major java concepts

[navyaajainnn]

Title: Propose Adding Important Java Concepts to Enhance Documentation

Description: I would like to propose the addition of key Java concepts to the project’s documentation (or codebase) to improve understanding for contributors and users. This would help those who are new to Java or those who want a deeper understanding of the underlying technologies used in the project.

Suggested Implementation:
Add a dedicated "Java Concepts" section to the documentation or wiki.
Optionally include code examples where these concepts are implemented in the project, showing how they relate to the codebase.
Ensure the explanations are beginner-friendly while offering enough depth for intermediate users.

[navyaajainnn]

Hey, @DHEERAJHARODE please assign me this