AWS CloudFormation gives you an easy way to model a collection of related AWS and third-party resources, provision them quickly and consistently, and manage them throughout their lifecycles, by treating infrastructure as code. A CloudFormation template describes your desired resources and their dependencies so you can launch and configure them together as a stack. You can use a template to create, update, and delete an entire stack as a single unit, as often as you need to, instead of managing resources individually. You can manage and provision stacks across multiple AWS accounts and AWS Regions.

Resource type identifiers always take the following form:

service-provider::service-name::data-type-name

You can find updated list here

Pseudo Parameters

AWS::AccountId                  12-digit AWS account
AWS::NoValue                    Use in conditionals
AWS::Region                     Deployment region
AWS::StackId                    ARN of the current stack
AWS::StackName                  Name of the current stack

Common Intrinsic Fn

!FindInMap [ Map, TopLevelKey, SecondLevelKey ] Returns values of keys in 2-level map declared in Mappings section
!GettAtt a.Arn                  Get Arn attribute of resource a in this stack
!ImportValue a                  Reference export a from another stack
!Join [':',['a','b']]           Produces 'a:b'
!Ref a                          Get value of parameter or resource a in this stack
!Select ['1',['a','b']]         Produces 'b'
!Split [ ':', 'a:b' ]           Produces ['a', 'b']
!Sub 'a-${b}'                   Inject the value of b into a string

You can’t nest the shorthand YAML functions. You must do: Fn::ImportValue: !Sub "${a}-b" not !ImportValue !Sub "${a}-b"

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