Quickies

Where are all parameters specs:

http://docs.ansible.com/ansible/intro_configuration.html

How to override default ansible configuration:

ANSIBLE_CONFIG (an environment variable)
ansible.cfg (in the current directory)
.ansible.cfg (in the home directory)
/etc/ansible/ansible.cfg

What are all constants of Ansible:

https://github.com/ansible/ansible/blob/devel/lib/ansible/constants.py

What is the best and pure yaml syntax for Ansible?

https://support.ansible.com/hc/en-us/articles/201957837-How-do-I-split-an-action-into-a-multi-line-format-