Free course on freeCodeCamp
freeCodeCamp's Learn DevOps Basics: Free Docker Course teaches Docker, the containerization platform that packages applications with their dependencies so they run anywhere. You learn Docker images, containers, and how to write Dockerfiles in 2 hours. The entire course is free on freeCodeCamp.org. After finishing, you understand how containers work and can containerize applications. Docker is essential DevOps knowledge used in nearly every modern deployment. The main limitation: 2 hours is an overview. Real containerization for production requires more depth and practice with orchestration (Kubernetes).
Container usage in the IT industry reached 92% in 2025, up from 80% a year earlier, though adoption across other industries sits at 30% (source: Docker's 2025 State of Application Development Report, docker.com/blog/2025-docker-state-of-app-dev).
freeCodeCamp's 2-hour Docker course covering containers, images, volumes, networks, Docker Compose, and writing Dockerfiles. Practical and project-driven: by the end you can containerise real applications. Free on YouTube.
DevOpsIntermediate
Microsoft Learn's primary DevOps path (replaces the retired AZ-400 Get-Started path). Covers source control with Git, GitHub workflows, branching strategies, Azure Boards, GitHub Projects, and applying DevOps practices at scale. Aligns with the AZ-400 certification.
DevOpsIntermediate
freeCodeCamp's full Kubernetes course covering pods, deployments, services, ingress, ConfigMaps, secrets, and Helm. Builds on a basic Docker foundation. Free and project-based.