circleci.com
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CircleCI is a CI/CD platform that automates building, testing, and deploying applications. The site provides comprehensive documentation, tutorials, sample configuration files, and real-world workflow examples to help you implement and optimize automated pipelines.
More resources on Continuous Integration/Continuous Deployment (CI/CD)
Continuous Integration: Improving Software Quality and Reducing Risk
A Jolt Award-winning Addison-Wesley Signature Series book on building a CI system from scratch. It covers automated builds, database integration, testing, inspection, deployment, and feedback, giving teams a practical blueprint for reducing integration risk and catching defects early.
Jenkins.io
Official documentation for Jenkins, the open-source automation server, covering installation, Pipeline syntax and Jenkinsfiles, agents, plugins, security and administration. Readers can set up a Jenkins controller and build, test and deploy code through declarative pipelines.
DevOps Bootcamp
Learn CI/CD with Nana's DevOps Bootcamp! Master continuous integration/deployment & automate your software release pipeline.
roadmap.sh/devops
An interactive step-by-step path through DevOps skills, from operating systems and scripting to containers, CI/CD, infrastructure as code and observability. Each node links to vetted free material, and progress can be tracked node by node.
GitHub Actions Documentation
GitHub's official reference and guides for GitHub Actions, covering workflow YAML syntax, triggers, runners, secrets, reusable workflows, and deployment. After working through it you can build, test, and release code automatically from any GitHub repository.
Continuous Delivery
Foundational 2010 book by Jez Humble and David Farley defining the deployment pipeline, covering version control of everything, automated build and test stages, configuration management, infrastructure and data migrations. Readers learn to make software releases routine, low-risk and repeatable.