In order to run this ansible playbook, run the below command on a control node that has SSH access to your host you are setting up.
ansible-playbook -i hosts site.yml --ask-become-pass
In my hosts file I define the below which basically says -
I have a group of hosts (in the example, only one) named webservers which contains the server with the hostname of, home-ubuntu-01.
[webservers]
home-ubuntu-01
This is referenced in the site.yml file which basically is the brains of the entire playbook. The site.yml defines which host groups things should run on, who the playbook should log in as (henry in this case), and what roles it should setup - just web in this case.