If you've got servers to administrate, users to manage and software to deploy, then you're love Ansible. ...Source
Ansible is a tool which can be used to automate daily routine IT tasks like application deployment, configuration management, and other IT professionals' routine tasks. In short, it makes an IT professional life and work a lot more easier.
There are other tools also available, but Ansible has several advantages over them, on top of them, it is an open source tool and almost zero coding skills are needed to start with.
There are many tutorials and training videos available online but if you are interested in learning it then I'd like to suggest, "Ansible Crash Course by Michael Crilly", which is more structured, organized and easy to understand.
Even if anyone is not an expert and just started in the field, the best choice for them is Ansible to begin with. One thing is for sure, it makes developers life/job more easy and increase their efficiency.