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A comprehensive guide to High-Level System Design covering design principles, constraints, scalability patterns, databases, caching, messaging, load balancing, and how to systematically approach and solve any system design problem.

A comprehensive guide to MySQL and SQL -- from basic concepts and DDL/DML to advanced queries, data integrity, transactions, and performance optimization.

An accessible introduction to Haskell — the purely functional programming language that makes math nerds blush with joy. Covers pure functions, lazy evaluation, type systems, monads, and real-world applications.