Free lessons
Basics: free lessons worked in a lab
Short, practical lessons on Git, SQL, APIs, Docker, Linux, networking, data and security. Every lesson is free to read in full. Create a free account to run its commands in a live lab of your own.
All the Basics lessons
Pick a lesson. Each page is the whole lesson, with the commands shown and the lab one step away.
Container lab
Git Basics
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SQL Basics
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API Basics
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Juice Shop Basics
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DVWA Basics
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WebGoat Basics
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Git Basics 2
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SQL Basics 2
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API Basics 2
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Juice Shop Basics 2
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DVWA Basics 2
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WebGoat Basics 2
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Static Routing Basics
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OSPF Basics
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BGP Basics
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Valkey Basics
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Kafka Basics
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Spark Basics
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Hadoop Basics
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Privilege Escalation Basics
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DHCP and DNS Basics
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Ansible Basics
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Observability Basics
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VLAN Basics
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NAT Basics
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WireGuard Basics
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Incident Response Basics
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SQL Injection Fix Basics
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Linux Administration Basics
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Docker Basics
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Mutillidae Basics
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WrongSecrets Basics
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Web Server Hardening Basics
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AI Coding Agent Basics
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AI Coding Agent Basics 2
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