Interactive practice

Java Basics

OOP

Exceptions

Collections and Generics

Streams and Lambdas

Date and Time

IO and NIO

Annotations and Reflection

JDBC

JPA

Concurrency

JMM

JVM

Testing

Project Build

Design Patterns

Spring Core

Spring Boot

Spring MVC

Spring Data JDBC

Spring Data JPA

Transactions

Spring Security

Spring Testing

Spring Cloud

SQL Basics

Filtering and Sorting

Aggregation

Joins

Subqueries

Indexes

Transactions and ACID

Isolation Levels

Locks and Deadlocks

Normalization

Optimization

Algorithm Basics

Big O

Arrays

Strings

Linked Lists

Hash Tables

Stacks and Queues

Sorting

Binary Search

Recursion

Trees

Graphs

Backtracking

Greedy Algorithms

Dynamic Programming

System Design Basics

Load Estimation

System Components

Data Storage

Caching

Service Communication

Monolith and Microservices

Distributed Systems

Scalability

Data and Consistency

Event-Driven Architecture

Reliability and Fault Tolerance

Observability

System Security

Designing Systems