Getting started with Ansible | Ansible Inventory, Ansible Configuration | Ansible Tutorial

Building an Ansible Inventory 
Managing Ansible Configuration Files 
Running Ad Hoc Commands 
Managing Dynamic Inventories 
Inventory is a collection of hosts (nodes) with associated data and groupings that Ansible can connect and manage.
Hosts (nodes)
Groups
Inventory-specific data (variables)
Static or dynamic sources
The stock configuration should be sufficient for most users, but there may be reasons you would want to change them.
If you installed Ansible from pip or from source, you may want to create this file in order to override default settings in Ansible.
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[mehransaeed]

Just a tip if managed node is unable to connect with control node even after adding the right permissions
sudo nano /etc/ssh/sshd_config

 add the new user ansible if created into the allowed users bit

[vinvvinv]

HI can you please explain the writing/structure of Ansible & Terraform in a simple manner like where to add spaces, hyphens, what is variable, etc it's a bit confusing ... please it's a request, do reply