diff --git a/ansible.cfg b/ansible.cfg
new file mode 100644
index 0000000..fa45324
--- /dev/null
+++ b/ansible.cfg
@@ -0,0 +1,3 @@
+[defaults]
+jinja2_extensions = jinja2.ext.do
+retry_files_enabled = False
diff --git a/load-vars/load-vars.yaml b/load-vars/load-vars.yaml
new file mode 100644
index 0000000..f34fe03
--- /dev/null
+++ b/load-vars/load-vars.yaml
@@ -0,0 +1,30 @@
+
+- name: Variables loaded dynamically are available everywhere in the playbook
+  gather_facts: no
+  hosts: localhost
+  tasks:
+  - include_vars: extra.yaml
+  roles:
+  - my-vars
+  post_tasks:
+  - debug:
+      var: extra
+  - debug:
+      var: extra_role
+  - assert:
+      that:
+      - extra is defined
+      - extra_role is defined
+
+- name: Even in another playbook !
+  gather_facts: no
+  hosts: localhost
+  tasks:
+  - debug:
+      var: extra
+  - debug:
+      var: extra_role
+  - assert:
+      that:
+      - extra is defined
+      - extra_role is defined
diff --git a/load-vars/roles/my-vars/tasks/main.yaml b/load-vars/roles/my-vars/tasks/main.yaml
new file mode 100644
index 0000000..f68cea1
--- /dev/null
+++ b/load-vars/roles/my-vars/tasks/main.yaml
@@ -0,0 +1,4 @@
+---
+
+- name: Include extra variables dynamically
+  include_vars: extra.yaml
\ No newline at end of file
diff --git a/load-vars/roles/my-vars/vars/extra.yaml b/load-vars/roles/my-vars/vars/extra.yaml
new file mode 100644
index 0000000..806d95d
--- /dev/null
+++ b/load-vars/roles/my-vars/vars/extra.yaml
@@ -0,0 +1,3 @@
+---
+
+extra_role: "I'm also there !"
\ No newline at end of file
diff --git a/load-vars/vars/extra.yaml b/load-vars/vars/extra.yaml
new file mode 100644
index 0000000..3574a18
--- /dev/null
+++ b/load-vars/vars/extra.yaml
@@ -0,0 +1,2 @@
+---
+  extra: "Yes, I'm there !"
\ No newline at end of file
diff --git a/selectattr-filter.yaml b/selectattr-filter.yaml
new file mode 100644
index 0000000..e952c5b
--- /dev/null
+++ b/selectattr-filter.yaml
@@ -0,0 +1,34 @@
+---
+
+- name: The selectattr filter can be used to filter a list, based on a criteria
+  gather_facts: no
+  hosts: localhost
+  vars: 
+    input:
+    - id: 2555418101286
+      system_name: hits
+    - id: 2555418119094
+      system_name: Say_Hello
+    - id: 2555418119095
+      system_name: Say_Goodbye
+  tasks:
+  - block:
+    - debug:
+        var: output
+    - assert:
+        that:
+        - output|length == 1
+        - (output|first).system_name == 'Say_Hello'
+    vars:
+      output: "{{ input|selectattr('id', 'equalto', id)|list }}"
+      id: 2555418119094
+  - block:
+    - debug:
+        var: output
+    - assert:
+        that:
+        - output|length == 1
+        - (output|first).id == 2555418119094
+    vars:
+      output: "{{ input|selectattr('system_name', 'equalto', system_name)|list }}"
+      system_name: Say_Hello
diff --git a/set-theory-filters.yaml b/set-theory-filters.yaml
new file mode 100644
index 0000000..dc227fe
--- /dev/null
+++ b/set-theory-filters.yaml
@@ -0,0 +1,25 @@
+---
+
+- name: 'Set Theory Filters: union operates on set of structured objects'
+  gather_facts: no
+  hosts: localhost
+  tasks:
+  - block:
+    - debug:
+        var: output
+    - assert:
+        that:
+        - output|length == 3
+    vars:
+      output: "{{ input1|union(input2) }}"
+      input1:
+      - id: 1
+        name: john
+      - id: 3
+        name: smith
+      input2:
+      - id: 1
+        name: john
+      - id: 2
+        name: jane
+
diff --git a/variables-in-templates/templates/sub-template.j2 b/variables-in-templates/templates/sub-template.j2
new file mode 100644
index 0000000..2afeb8d
--- /dev/null
+++ b/variables-in-templates/templates/sub-template.j2
@@ -0,0 +1 @@
+{{ input|default("KO") }}{{ input_template|default("KO") }}OK
\ No newline at end of file
diff --git a/variables-in-templates/templates/template.j2 b/variables-in-templates/templates/template.j2
new file mode 100644
index 0000000..470f15e
--- /dev/null
+++ b/variables-in-templates/templates/template.j2
@@ -0,0 +1,2 @@
+{%- set input_template = "OK" -%}
+{{ lookup('template', 'sub-template.j2') }}
\ No newline at end of file
diff --git a/variables-in-templates/variables-in-templates.yaml b/variables-in-templates/variables-in-templates.yaml
new file mode 100644
index 0000000..7dc838d
--- /dev/null
+++ b/variables-in-templates/variables-in-templates.yaml
@@ -0,0 +1,16 @@
+---
+
+- name: 'Variable in templates: a template can use a variable from task or playbook but not from an outter template'
+  gather_facts: no
+  hosts: localhost
+  vars: 
+    input: 'OK'
+  tasks:
+  - block:
+    - debug:
+        var: output
+    - assert:
+        that:
+        - output == "OKKOOK"
+    vars:
+      output: "{{ lookup('template', 'template.j2') }}"