YAML (YAML Ain't Markup Language) is a human-friendly data serialization standard often used for configuration files. Below is a basic guide to get you started.

YAML Basics

Step-01: Comments & Key Value Pairs

• Space after colon is mandatory to differentiate key and value

# Defining simple key value pairs
name: James
age: 33
city: Mumbai

Step-02: Dictionary / Map

• Set of properties grouped together after an item
• Equal amount of blank space required for all the items under a dictionary

person:
  name: James
  age: 33
  city: Mumbai

Step-03: Array / Lists

• Dash indicates an element of an array

person: # Dictionary
  name: James
  age: 33
  city: Mumbai
  hobbies: # List  
    - cycling
    - cookines
  hobbies: [cycling, cooking]   # List with a differnt notation  

Step-04: Multiple Lists

• Dash indicates an element of an array

person: # Dictionary
  name: James
  age: 33
  city: Mumbai
  hobbies: # List  
    - cycling
    - cooking
  hobbies: [cycling, cooking]   # List with a differnt notation  
  friends: # 
    - name: friend1
      age: 22
    - name: friend2
      age: 25            

Step-05: Sample Pod Tempalte for Reference

apiVersion: v1 # String
kind: Pod  # String
metadata: # Dictionary
  name: myapp-pod
  labels: # Dictionary 
    app: myapp         
spec:
  containers: # List
    - name: myapp
      image: nginx
      ports:
        - containerPort: 80
          protocol: "TCP"
        - containerPort: 81
          protocol: "TCP"