The directory

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Every track, grouped by area — 44 tracks across 423 chapters. Hover a folder to open its topics.

System Design Core system design concepts and case studies DSA Data structures and algorithms Networking How the internet works, TCP/IP, DNS, HTTP DB Internals Storage engines, B-trees, WAL, MVCC SQL Querying, joins, indexes, transactions, and query optimization Operating Systems Processes, threads, memory, scheduling, and system calls

Go Go from fundamentals to production Frontend Rendering patterns, state management, performance

API Design REST, pagination, versioning, rate limiting GraphQL Schema design, resolvers, subscriptions gRPC Protobuf, streaming, interceptors, TLS WebSockets Real-time, pub/sub, presence, backpressure Webhooks Sending, signing, retries, idempotency

Linux / VPS SSH, systemd, firewall, processes Web Servers Nginx, reverse proxy, edge caching TLS & Certs Let's Encrypt, ACME, certificate management DevOps Containers, Kubernetes, CI/CD, IaC Containers Docker fundamentals and patterns Orchestration Kubernetes and container orchestration IaC Infrastructure as code, Terraform

Data Modeling Entities, normalization, schema evolution NoSQL Key-value, document, wide-column, and graph data models Auth & Security Authentication, authorization, security patterns API Gateway Gateway patterns, routing, aggregation Caching Cache strategies, Redis, CDN Redis Data structures, persistence, pub/sub, streams, and clustering Background Jobs Job queues, workers, scheduling Messaging Message queues, Kafka, RabbitMQ Event-Driven Event sourcing, CQRS, Saga pattern Storage Object storage, block storage, file systems Search Full-text search, Elasticsearch, indexing

Load Balancing Algorithms, health checks, session affinity Horizontal Scaling Stateless services, auto-scaling Replication & Sharding Database scaling strategies Distributed Systems CAP, consistency, consensus, ordering, and distributed transactions

Observability Metrics, logging, tracing, alerting SRE SLIs, SLOs, incident response, chaos engineering Testing Unit, integration, E2E, contract testing Performance Profiling, optimization, benchmarking Disaster Recovery RTO, RPO, backup strategies Capacity & Cost FinOps, capacity planning, cost optimization Microservices Service boundaries, communication, patterns Chaos & Resilience Fault injection, circuit breakers, bulkheads

Ethical Hacking Penetration testing, OSINT, exploitation, CTF — zero to professional