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Quick Reference Guides

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Database & SQL Quick Reference

Database

A comprehensive quick reference guide for database and SQL fundamentals covering ACID properties, normalization, indexes, isolation levels, locks, data integrity, query optimization, and advanced concepts. Perfect for interview preparation and quick recall of essential database knowledge.

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Data Structures Quick Reference

Architecture

A comprehensive visual guide to 30+ essential data structures organized by category. Each structure includes real-world analogies, Big-O complexity analysis, practical use cases, and filtering by popularity. From fundamental arrays and linked lists to specialized structures like Fenwick trees and suffix trees—everything you need to choose the right data structure for your problem.

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Design Patterns Quick Reference

Architecture

Master the essentials with visual memory aids. Each pattern is presented as a card with a memorable real-world analogy and image, making it easier to recall and apply the right pattern when you need it. Filter by popularity to focus on the most commonly used patterns first.

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OWASP Top 10

Security

A comprehensive quick reference guide for the OWASP Top 10 2025 Release Candidate, featuring the most critical web application security risks with practical examples and mitigation strategies for developers.

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React

Front End

Master React fundamentals for modern web development

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