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Understanding Terraform Blocks, Arguments, and Identifiers

1. Blocks in Terraform

• Blocks represent specific types like resource, variable, and output.
• Blocks can be simple or nested inside another block.

2. Arguments

• Arguments are used within a block to assign values to specific names.
• Some arguments are mandatory, while others are optional.

3. Identifiers

• Identifiers represent the names of arguments, block types, or other Terraform constructs.
• Identifiers can include letters, underscores, hyphens, and digits but cannot start with a digit.

4. Expressions

• Expressions are used to assign values to identifiers within a block.
• Expressions can be simple or complex.

5. Comments

• A single-line comment starts with a # symbol.

6. HCL (HashiCorp Configuration Language)

• HCL is declarative, meaning you define the desired end state of infrastructure.
• The order of blocks or files does not matter.