chore(kb/yaml): add gotcha about key naming convention

knowledge base/yaml.md

@@ -1,12 +1,14 @@
 # YAML
 
-## Table of contents <!-- omit in toc -->
-
 1. [TL;DR](#tldr)
 1. [Further readings](#further-readings)
 
 ## TL;DR
 
+There is no key naming convention.<br/>
+Best practice is to use the one used by the users or tools using that file (e.g.: Kubernetes --> camelCase, CircleCI -->
+snake_case, Jenkins --> kebab-case).
+
 ```yaml
 ---
 # This is a comment
@@ -22,19 +24,23 @@ object:
     can: do
     lists:
       - too
+"key:with:chars": requiring quotation
 ```
 
 ## Further readings
 
 - [yaml-multiline.info]
 - [`yamllint`][yamllint]
+- [What is the canonical YAML naming style]
 
 <!--
-  References
+  Reference
+  ═╬═Time══
   -->
 
 <!-- Knowledge base -->
 [yamllint]: yamllint.md
 
 <!-- Others -->
+[what is the canonical yaml naming style]: https://stackoverflow.com/questions/22771226/what-is-the-canonical-yaml-naming-style
 [yaml-multiline.info]: https://yaml-multiline.info