📚 CodeByTushu Developer Study Notes & Engineering Guides

Comprehensive Engineering Study Notes, Full-Stack Project Source Code, FAANG Interview Guides & Cheat Sheets

Curated with ❤️ by Tushpendra Kumar (CodeByTushu)

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🌟 Overview

Welcome to the official CodeByTushu Developer Study Notes & Reference Guides repository!

This repository powers the Resources ➔ GitHub Source Code section of CodeByTushu.com. Here you will find production-quality source code, hands-on architectural patterns, in-depth technical documentation, and interview preparation guides across Java OOP, React Frontend, Data Structures & Algorithms, Node.js Backend, Artificial Intelligence, and Relational Databases (SQL).

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📖 Curated Projects & Source Code Directory

#	Topic / Project	Primary Tech Stack	Source Code	Comprehensive Guide	Live Article
01	Master Object-Oriented Programming in Java	Java 17+ OOP Pillars SOLID Design Patterns	📂 View Code	📖 Read Notes	🌐 Live Post
02	React Frontend Development Complete Guide	React 18+ Vite Custom Hooks Context API	📂 View Code	📖 Read Notes	🌐 Live Post
03	Data Structures & Algorithms Interview Guide	Java Python Graphs DP BFS/DFS	📂 View Code	📖 Read Notes	🌐 Live Post
04	Node.js Backend Development Guide	Node.js Express MongoDB JWT Auth	📂 View Code	📖 Read Notes	🌐 Live Post
05	Artificial Intelligence Complete Guide	Python OpenAI API Embeddings LLMs	📂 View Code	📖 Read Notes	🌐 Live Post
06	Complete SQL & Database Guide	PostgreSQL MySQL Window Functions ACID	📂 View Code	📖 Read Notes	🌐 Live Post

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🏛️ Repository Architecture

CodeByTushu-Developer-Study-Notes/
├── 01-master-oop-in-java/
│   ├── src/com/codebytushu/oop/     # Encapsulation, Inheritance, Polymorphism, Abstraction, SOLID, Patterns
│   │   └── casestudy/               # Full Library Management System case study
│   ├── StudyNotes.md                # 1,800+ lines comprehensive guide
│   └── README.md
│
├── 02-react-frontend-development-complete-guide/
│   ├── src/                         # Components, custom hooks (useFetch, useDebounce, useLocalStorage), Context
│   ├── package.json                 # Modern Vite configuration
│   ├── StudyNotes.md                # Complete React 18/19 guide
│   └── README.md
│
├── 03-dsa-interview-guide-algorithms/
│   ├── src/java/                    # BFS, DFS, Dijkstra, Knapsack, Coin Change
│   ├── src/python/                  # Pythonic graph and shortest path implementations
│   ├── StudyNotes.md                # 1,300+ lines FAANG interview preparation handbook
│   └── README.md
│
├── 04-nodejs-backend-development-guide/
│   ├── src/                         # Express MVC: models, controllers, routes, auth & error middlewares
│   ├── package.json
│   ├── StudyNotes.md                # 2,200+ lines backend engineering guide
│   └── README.md
│
├── 05-artificial-intelligence-complete-guide/
│   ├── src/python/                  # OpenAI chat completions, vector cosine embeddings, CoT prompts
│   ├── src/javascript/              # Node.js AI client SDK
│   ├── StudyNotes.md                # Complete AI/ML handbook
│   └── README.md
│
├── 06-complete-sql-and-database-guide/
│   ├── schemas/                     # 3NF E-Commerce schema (DDL & DML)
│   ├── queries/                     # ROW_NUMBER, DENSE_RANK, LAG, CTEs, Indexing
│   ├── StudyNotes.md                # 1,200+ lines RDBMS & transaction handbook
│   └── README.md
│
├── study-notes/                     # Raw reference markdown notes library
├── assets/                          # CodeByTushu branding & logos
├── .gitignore
├── LICENSE
└── README.md

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💡 How to Use These Resources

1. Direct Practice on GitHub: Browse into any project folder (e.g. 01-master-oop-in-java/) and inspect the runnable code files.
2. Clone the Entire Hub Locally:

   git clone https://github.com/CodeByTushu/CodeByTushu-Developer-Study-Notes.git

3. Connect with the Online Guides: Each project contains a direct link back to its corresponding interactive blog on codebytushu.com, including interactive quizzes and practice problems.

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🌐 Official CodeByTushu Community & Links

• 🌍 Official Website: https://codebytushu.com
• 🚀 LeetCode Daily Hub: https://codebytushu.com/Leetcode/
• ▶️ YouTube Channel: @codebytushu
• 📱 WhatsApp Channel: Join CodeByTushu Community
• 📸 Instagram: @codebytushu
• 💼 LinkedIn: CodeByTushu
• 🐙 GitHub Organization: https://github.com/CodeByTushu

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