ansible.com
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Ansible.com is the official site for Ansible, the open-source IT automation platform, offering product information, documentation, tutorials, modules, and community resources to help automate configuration, deployment, and orchestration.
More resources on Configuration Management
Jeff Geerling's Ansible Content
Practitioner blog with free guides and book excerpts, frequent Reddit rec
Ansible Documentation
Official free docs, highly upvoted in r/devops for learning config management
Terraform in 100 Seconds + Install & First Example
Quick intro to Terraform as IaC config mgmt tool, top comment in config mgmt threads
puppet.com
Puppet.com is the official home of Puppet, an automation and configuration management platform for IT infrastructure. It offers product information, documentation, tutorials, webinars, and access to Puppet Forge modules to learn and implement configuration management across servers and cloud environments.
Puppet 5 Beginner’s Guide
Puppet 5 Beginner’s Guide - A book resource
Learning Chef
Learning Chef - A book resource