diff --git a/README.md b/README.md
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--- a/README.md
+++ b/README.md
@@ -1,2 +1,114 @@
 # ansible-target-practice
+This repository is an example that accomplishes the following:
+
+- stop/start based on a variable (`targetpractice`)
+- If instances need to be started they are registered in a targetgroup when they become
+  reachable
+- If instances need to be stopped the are first removed from the targetgroup
+
+
+## Dependencies
+```
+ansible-galaxy collection install amazon.aws
+ansible-galaxy collection install community.aws
+```
+
+
+## EC2 credentials
+Make sure you have a profile that can access the necessary AWS resources.
+Configure your AWS cli as described here
+[](https://docs.aws.amazon.com/cli/latest/userguide/cli-configure-files.html)
+
+You can use Environment Variables to specify configuration options of the AWS cli.
+More info here: [](https://docs.aws.amazon.com/cli/latest/userguide/cli-configure-envvars.html)
+
+Minimal example:
+
+`~/.aws/credentials`
+
+```
+[zoolite/vincent]
+aws_access_key_id=AKIAWNB2RT65DGTW
+aws_secret_access_key=Yhdg280zGg3U7CQVcyLAqLEs9/Wv6cYb7UYB6L0
+```
+
+
+
+`~/.aws/config`
+
+```
+[profile zoolite/vincent]
+region=eu-west-1
+output=text
+```
+
+You can use this profile by setting the `AWS_PROFILE` environment variable
+
+```
+export AWS_PROFILE=zoolite/vincent
+```
+
+Run `aws sts get-caller-identity` to test authentication
+
+
+## Ansible EC2 inventory plugin
+The Ansible EC2 inventory plugin allows you to create groups based on tags
+defined on resources. The configuration of this inventory plugin can be done
+through a configuration file.
+
+In this example we wan to create a group `dev` and should contain all
+instance that have a tag `env=dev`. We also create a group `tag_env_dev` which
+contains the same hosts.
+
+Create a file `aws_ec2.yml` with the following content
+
+```
+plugin: aws_ec2
+regions:
+  - eu-west-1
+filters:
+  tag:env:
+    - dev
+    - prod
+hostnames:
+  - private-dns-name
+  - ip-address
+  - network-interface.addresses.private-ip-address
+keyed_groups:
+  - key: tags.env
+    separator: ""
+  - prefix: tag
+    key: tags
+```
+
+### Filters
+In the example we apply a filter so we only end up with resources who have a tag
+`env` with a value of either `dev` or `prod`
+
+
+### Hostnames
+In this example we only want to use the private ip addresses, private dns record
+or the public ip address in our inventory. This can be defined in the `hostnames` section.  
+
+This list uses the order as preference. Example: If you prefer to use the prive
+dns records you need to put the `private-dns-name` option above all alse in the
+list.
+
+You can use the options defined in the AWS CLI `--filter` section.
+[](https://docs.aws.amazon.com/cli/latest/reference/ec2/describe-instances.html#options)
+
+
+## Test the inventory
+Testing the inventory can be done using `ansible-inventory`
+
+```
+ansible-inventory -i aws_ec2.yml --list
+```
+
+## Testing
+
+```
+ansible-playbook -i aws_ec2.yml site.yml --extra-vars '{"targetpractice": "false"}'
+```
+
 
diff --git a/ansible.cfg b/ansible.cfg
new file mode 100644
index 0000000..b7f2c56
--- /dev/null
+++ b/ansible.cfg
@@ -0,0 +1,2 @@
+[defaults]
+deprecation_warnings=False
diff --git a/aws_ec2.yml b/aws_ec2.yml
new file mode 100644
index 0000000..7f9df00
--- /dev/null
+++ b/aws_ec2.yml
@@ -0,0 +1,22 @@
+plugin: aws_ec2
+regions:
+  - eu-west-1
+filters:
+  tag:env:
+    - prod
+hostnames:
+  - network-interface.association.public-ip
+  - network-interface.addresses.private-ip-address
+  - ip-address
+  - network-interface.addresses.private-ip-address
+  - private-dns-name
+  - instance-id
+keyed_groups:
+  - key: tags.env
+    separator: ""
+    #prefix: MyGroupPrefix
+  - prefix: tag
+    key: tags
+
+fact_caching_timeout: 10
+caching_timeout: 10
diff --git a/site.yml b/site.yml
new file mode 100644
index 0000000..fa05482
--- /dev/null
+++ b/site.yml
@@ -0,0 +1,49 @@
+- hosts: tag_env_prod
+  remote_user: ec2-user
+  gather_facts: false  # of no use
+  connection: local # prevent from trying to ssh into instance
+
+  vars:
+    target_group_arn: "arn:aws:elasticloadbalancing:eu-west-1:440357826049:targetgroup/TestAnsible/c2afd83500139d9a"
+
+  tasks:
+    - name: DEBUG
+      debug:
+        msg: "{{ hostvars[inventory_hostname].instance_id }}"
+
+    - name: Start instances
+      amazon.aws.ec2:
+        instance_ids: "{{ hostvars[inventory_hostname].instance_id }}"
+        state: running
+      when: targetpractice == "true"
+
+    - name: Wait for instances to be reachable
+      wait_for:
+        host: "{{ inventory_hostname }}"
+        port: 22
+      when: targetpractice == "true"
+
+    - name: Register targets in TargetGroup
+      community.aws.elb_target:
+        target_group_arn: "{{ target_group_arn }}"
+        state: present
+        target_id: "{{ hostvars[inventory_hostname].instance_id }}"
+        target_status: "unused"
+      when: targetpractice == "true"
+    
+    - name: Deregister targets in TargetGroup
+      community.aws.elb_target:
+        target_group_arn: "{{ target_group_arn }}"
+        state: absent
+        target_id: "{{ hostvars[inventory_hostname].instance_id }}"
+        target_status: "unused"
+        deregister_unused: yes
+      when: targetpractice == "false"
+    
+    - name: Stop instances
+      amazon.aws.ec2:
+        instance_ids: "{{ hostvars[inventory_hostname].instance_id }}"
+        #instance_ids: "{{ play_hosts }}"
+        state: stopped
+      when: targetpractice == "false"
+