Cool Notes

Every card here links to the primary source, not a summary of one — official documentation, a well-regarded book, or a guide the community actually recommends, spanning DSA, DBMS, operating systems, computer networks, OOPS, system design, cloud platforms, AI/ML and the major languages and frameworks. Filter by category to skip straight to what you're revising, or browse everything if you're mapping out what to learn next.

All CategoriesAWSAndroidBackendCC++CSSComputer NetworksDSADjangoDockerFlaskFrontendGit & GitHubHTML5JavaJavaScriptKubernetesLinuxMachine LearningMongoDBNode.jsOOPSPHPPythonReactSQLSpring BootSystem Design (HLD)System Design (LLD)

66 notes found

Python

Python Handbook

C

C Handbook

HTML5

HTML Handbook

SQL

MySQL Handbook

MongoDB

MongoDB Handbook

Git & GitHub

Git Handbook

Linux

Linux Handbook

Python

Python Complete Notes

C

C Complete Notes

Android

Android Complete Notes

Java

Java Complete Notes

HTML5

HTML Complete Notes

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