📚 Free Coding PDFs (2026 Edition)
Download high-quality visual PDFs for Java, Python, DSA, System Design, DevOps & Microservices.
All PDFs include diagrams, cheatsheets & interview-ready notes.
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🔥 Java PDFs
Java + DSA Cheatsheet (50 Pages)
Core Java + OOP + Collections + DSA diagrams. Perfect for interview prep.
Download Free PDFJava Collections Visual Guide
HashMap, List, Set, Queue, Stack, internal working & diagrams.
Download Free PDFJava OOP Notes + Diagrams
Inheritance, polymorphism, abstraction, encapsulation explained visually.
Download Free PDF🐍 Python PDFs
Python Basics + Cheatsheet
Syntax, loops, functions, modules, error handling—all simplified.
Download Free PDF🧩 DSA PDFs
DSA 75 Questions (Visual)
Arrays, DP, Trees, Strings & Graph patterns with templates.
Download Free PDF🏛 System Design PDFs
System Design Basics (Visual)
API gateway, caching, load balancing, rate limiting & diagrams.
Download Free PDF15 Mini System Design Problems
URL shortener, chat app, notifications, file storage etc.
Download Free PDF⚙ DevOps PDFs
Docker & Kubernetes Notes
Images, pods, deployments, services & architecture diagrams.
Download Free PDF🔗 Microservices PDFs
Microservices Architecture Basics
API Gateway, Eureka, Config Server, communication & SAGA.
Download Free PDFEvent Driven Systems (Kafka)
Kafka architecture, microservices events, design patterns.
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