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Data Structures & AlgorithmsComplexity analysis up to graphs and DP.Operating SystemsProcesses, scheduling, memory and concurrency.Database Management SystemsRelational modelling, transactions and indexing.Computer NetworksFrom wires and radio waves up to the web.

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AI Inference EngineeringQuantization, batching and KV caching in production.System DesignScalable systems from first principles.Context EngineeringDesigning the context that LLMs actually reason over.Docker & KubernetesContainers and orchestration, explained.

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SQL & Databases

Database Foundations4

SQL Fundamentals5

Joins & Aggregation5

Design & Normalization4

Transactions & Performance4

ACID and transactions: the four promises every database makes
Concurrency and isolation levels
Query execution and EXPLAIN: seeing what the database actually does
Performance tuning, hands-on: fixing a genuinely slow query

PostgreSQL Deep Dive4

MySQL & MariaDB4

NoSQL & Choosing the Right Database5

Advanced SQL Toolkit5

Lessons

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SQL & Databases

Database Foundations4

SQL Fundamentals5

Joins & Aggregation5

Design & Normalization4

Transactions & Performance4

ACID and transactions: the four promises every database makes
Concurrency and isolation levels
Query execution and EXPLAIN: seeing what the database actually does
Performance tuning, hands-on: fixing a genuinely slow query

PostgreSQL Deep Dive4

MySQL & MariaDB4

NoSQL & Choosing the Right Database5

Advanced SQL Toolkit5

Learn SQL & Databases Transactions & Performance

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Performance tuning, hands-on: fixing a genuinely slow query

A real slow query, diagnosed and fixed step by step using EXPLAIN, indexing, and query rewriting - tying the whole module together.

12 min readUpdated 2026-09-04performancehands-onindexingquery-optimization