A playbook allows you to manage multiple configurations and complex deployments on many machines simply and easily. This is one of the key benefits of using Ansible for the delivery of complex applications. With playbooks, you can organize your tasks in a logical structure as tasks are (generally) executed in the order they are written, allowing you to have a good deal of control over your automation processes. With that said, it is possible to perform tasks asynchronously, so where tasks are not executed in sequence, we will highlight this. Our goal is that once you complete this chapter, you will understand the best practices for writing your own Ansible playbooks.
Although YAML format is easy to read and write, it is very pedantic when it comes to spacing. For example, you cannot use tabs to set indentation even though on the screen a tab...