diff --git a/knowledge base/acronyms and abbreviations.md b/knowledge base/acronyms and abbreviations.md
index f6d74d6..90f0e85 100644
--- a/knowledge base/acronyms and abbreviations.md	
+++ b/knowledge base/acronyms and abbreviations.md	
@@ -74,6 +74,7 @@
 | PDF     | Portable Document Format                               |                                                                                                     |
 | PEBCAK  | Problem Exists Between Chair And Keyboard              |                                                                                                     |
 | PGP     | Pretty Good Privacy                                    |                                                                                                     |
+| RBAC    | Role-Based Access Control                              |                                                                                                     |
 | ROM     | Read-Only Memory                                       |                                                                                                     |
 | RPM     | Revolutions Per Minute                                 |                                                                                                     |
 | RPM     | RPM Package Manager                                    | Package management system used by Linux distributions like Red Hat, (open)SuSE and Fedora           |
@@ -119,6 +120,7 @@
 - [SBOM at a Glance]
 - [What is OpenID Connect]
 - [Continuous delivery]
+- [URL, URI, URN: what's the difference?]
 
 <!--
   Reference
@@ -152,3 +154,4 @@
 [sbom at a glance]: https://www.ntia.gov/sites/default/files/publications/sbom_at_a_glance_apr2021_0.pdf
 [service as a software substitute]: https://www.gnu.org/philosophy/who-does-that-server-really-serve.html
 [what is openid connect]: https://openid.net/developers/how-connect-works/
+[url, uri, urn: what's the difference?]: https://auth0.com/blog/url-uri-urn-differences/
diff --git a/knowledge base/ansible.md b/knowledge base/ansible.md
index 0188fb5..56b04b6 100644
--- a/knowledge base/ansible.md	
+++ b/knowledge base/ansible.md	
@@ -847,6 +847,8 @@ See [Integrate with AWS SSM].
 - [Setup module source code]
 - [8 ways to speed up your Ansible playbooks]
 - [Blocks]
+- [How to work with lists and dictionaries in Ansible]
+- [Handling secrets in your Ansible playbooks]
 
 <!--
   Reference
@@ -887,6 +889,7 @@ See [Integrate with AWS SSM].
 [creating your own ansible filter plugins]: https://www.dasblinkenlichten.com/creating-ansible-filter-plugins/
 [easy things you can do to speed up ansible]: https://mayeu.me/post/easy-things-you-can-do-to-speed-up-ansible/
 [edit .ini file in other servers using ansible playbook]: https://syslint.com/blog/tutorial/edit-ini-file-in-other-servers-using-ansible-playbook/
+[handling secrets in your ansible playbooks]: https://www.redhat.com/sysadmin/ansible-playbooks-secrets
 [how can i hide skipped tasks output in ansible]: https://stackoverflow.com/questions/39189549/how-can-i-hide-skipped-tasks-output-in-ansible#76147924
 [how to append to lists]: https://blog.crisp.se/2016/10/20/maxwenzin/how-to-append-to-lists-in-ansible
 [how to get an arbitrary remote user's home directory in ansible?]: https://stackoverflow.com/questions/33343215/how-to-get-an-arbitrary-remote-users-home-directory-in-ansible#45447488
@@ -894,6 +897,7 @@ See [Integrate with AWS SSM].
 [how to recursively set directory and file permissions]: https://superuser.com/questions/1024677/ansible-how-to-recursively-set-directory-and-file-permissions#1317715
 [how to set up and use python virtual environments for ansible]: https://www.redhat.com/sysadmin/python-venv-ansible
 [how to speed up ansible playbooks drastically?]: https://www.linkedin.com/pulse/how-speed-up-ansible-playbooks-drastically-lionel-gurret
+[how to work with lists and dictionaries in ansible]: https://www.redhat.com/sysadmin/ansible-lists-dictionaries-yaml
 [human-readable output format]: https://www.shellhacks.com/ansible-human-readable-output-format/
 [include task only if file exists]: https://stackoverflow.com/questions/28119521/ansible-include-task-only-if-file-exists#comment118578470_62289639
 [is it possible to use inline templates?]: https://stackoverflow.com/questions/33768690/is-it-possible-to-use-inline-templates#33783423
diff --git a/snippets/ansible/tasks.yml b/snippets/ansible/tasks.yml
index a7d41ec..5da5560 100644
--- a/snippets/ansible/tasks.yml
+++ b/snippets/ansible/tasks.yml
@@ -99,6 +99,10 @@
           - something else
       set_fact:
         first_non_null_value: "{{ list_with_null_values | select | first }}"
+    - name: Get values for a specific attribute in a list of dictionaries
+      set_fact:
+        vpc_security_group_ids: >-
+          {{ instance_information.vpc_security_groups | map(attribute='vpc_security_group_id') }}
 
 - name: Manipulate dictionaries
   block: