AWS CloudFormation - my first stack

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{
"AWSTemplateFormatVersion" : "2010-09-09", - optional

"Description" : "AWS CloudFormation Sample Template DynamoDB_Table: 

       This template demonstrates creation of DynamoDB table.- optional


"Parameters" : { - optional, Values to pass to template at runtime,

                      when creating/updating stack

"HashKeyElementName" : {
"Description" : "HashType PrimaryKey Name",
"Type" : "String",
"AllowedPattern" : "[a-zA-Z0-9]*",
"MinLength": "1",
"MaxLength": "2048",
"ConstraintDescription" : "must contain only alphanumberic characters"
    },

"HashKeyElementType" : {
"Description" : "HashType PrimaryKey Type",
"Type" : "String",
"Default" : "S",
"AllowedPattern" : "[S|N]",
"MinLength": "1",
"MaxLength": "1",
"ConstraintDescription" : "must be either S or N"
    },

"ReadCapacityUnits" : {
"Description" : "Provisioned read throughput",
"Type" : "Number",
"Default" : "5",
"MinValue": "5",
"MaxValue": "10000",
"ConstraintDescription" : "must be between 5 and 10000"
    },

"WriteCapacityUnits" : {
"Description" : "Provisioned write throughput",
"Type" : "Number",
"Default" : "10",
"MinValue": "5",
"MaxValue": "10000",
"ConstraintDescription" : "must be between 5 and 10000"
    }
  },

"Resources" : { - required, The stack resources and their properties

'myDynamoDBTable' is the Logical ID for the resource being created here

"myDynamoDBTable" : { - the resource being created, can be referred 

                            in resources and outputs 
"Type" : "AWS::DynamoDB::Table", - Resource type
"Properties" : { - Set of properties
"AttributeDefinitions": [ { 
"AttributeName" : {"Ref" : "HashKeyElementName"},
"AttributeType" : {"Ref" : "HashKeyElementType"}
        } ],
"KeySchema": [
          { "AttributeName": {"Ref" : "HashKeyElementName"}, "KeyType": "HASH" }
        ],
"ProvisionedThroughput" : {
"ReadCapacityUnits" : {"Ref" : "ReadCapacityUnits"},
"WriteCapacityUnits" : {"Ref" : "WriteCapacityUnits"}
        }                
      }
    }
  },

"Outputs" : { - optional, Describes values returned when we view stack's properties
'TableName' is the logical Id used for below output value

"TableName" : {
"Value" : {"Ref" : "myDynamoDBTable"}, Value to return
"Description" : "Table name of the newly created DynamoDB table"

If we want to use this value in a different stack we use the export attribute
    }

  }
}