diff --git a/README.md b/README.md
index 0a53452..fe8352d 100644
--- a/README.md
+++ b/README.md
@@ -8,7 +8,7 @@ Red Hat Certified Specialist in Ansible Automation (EX407) Preparation Course
 ## Understanding Core Components of Ansible
 ### Understanding Core Components of Ansible Part 1
 This series of lessons lays the foundation for the remainder of the course content. Through a combination of lecture and command line demonstration, Students will gain a broad overview of Ansible. This particular lesson, focuses on Ansible inventories.
-
+  
 - Overview
   - Invetories
   - Modules
@@ -19,4 +19,27 @@ This series of lessons lays the foundation for the remainder of the course conte
   - Configuration files
 
 ##### Inventories
-![img](https://github.com/Bes0n/EX407-Ansible-Automation/blob/master/images/img1.png)
\ No newline at end of file
+![img](https://github.com/Bes0n/EX407-Ansible-Automation/blob/master/images/img1.png)
+
+- Inventory files may simply consist of a list of hostnames but can be much more robust
+
+- It is also possible to define groups of hosts, host or group level variables, and groups of groups withing the inventory
+
+- There are a number of variables that may be used within the inventory to control how ansible connects to and interacts with target hosts
+
+Commands to call ansible with `ping` module:
+    - ```ansible innaghiyev1c.mylabserver.com -m ping -k``` - call ping module on `innaghiyev1c.mylabserver.com` host. Where `-m ping` is ping module
+    and `-k` is key for asking password
+    - ```ansible all -m ping -k``` - call all defined hosts in your inventory list `/etc/ansible/hosts/`
+    - ```ansible -i inv.ini httpd -m ping -k``` - where `-i` - inventory file place, `httpd` hosts group name inside of `inv.ini` file
+  
+Output:
+```
+innaghiyev1c.mylabserver.com | SUCCESS => {
+    "ansible_facts": {
+        "discovered_interpreter_python": "/usr/bin/python"
+    },
+    "changed": false,
+    "ping": "pong"
+}
+```
\ No newline at end of file