Key Learnings- Functional Programming : Higher-order functions, Pure function, Immutable Data, Declarative Programming with Functional Composition, Declarative Programming with Streaming, Lambda Expression, Method Reference.- Maven Development : Proficient in Maven for project management, dependency management, build automation, and multi-module projects with dependency management.- Spring Boot : for creating robust, production-ready applications, and building stand-alone, production-grade Spring-based applications, Spring Boot includes:auto-configuration, embedded servers, and the ability to package your application as an executable JAR or WAR file.- Data Structure : ArrayList, LinkedList, HashSet, LinkedHashSet, TreeSet, HashMap, LinkedHashMap, Stack, Queue.- Design Patterns : Singleton, Builder, Factory, Delegation, Iterator, Strategy, Chain of Responsibility,Singleton Pattern is used through various approaches (Eager Initialization, Lazy Initialization, Thread-Safe, Double-Checked Locking, Bill Pugh, Enum).- SOLID Principles- Error Handling : Enhanced abilities in managing and handling errors using Global Controller Advice and creating custom exceptions.- RESTful API and Web Service-Spring Data JPA and Hibernate-Liquibase : Learn how to manage and version database schema changes using Liquibase for better control.-Docker: Image, Container, Networking, Volumes, Dockerfile and Docker-Compose.