Article for explaining custom policy syntax

Question

Can someone recommend articles that explain the syntax of a custom policy so that I can write good custom policy without doing guess work.

For example when do we need to include condition, why is resource normally assigned with *, can we use ARN instead of resource in the policy.

Unfortunately, the article [Policies and Permissions](https://docs.aws.amazon.com/IAM/latest/UserGuide/access_policies.html) does not explain the syntax. 
Thanks

AWS-User-alantam · Accepted Answer

[This](https://docs.aws.amazon.com/IAM/latest/UserGuide/reference_policies.html) should help understand the syntax. There are also many policy [examples](https://docs.aws.amazon.com/IAM/latest/UserGuide/access_policies_examples.html) and [Policy Generator](https://awspolicygen.s3.amazonaws.com/policygen.html) for you to use as a handy tool to write policies.

AWS-Eric · Answer

Hi, hannah

This contains explainations on policy type with writing structure, including code examples https://spacelift.io/blog/iam-policy  It includes Conditions examples with filtering on that as well.

If this helps solve your problem, please choose this as the Accepted Answer so others on re:Post may benefit - Thank you!

Article for explaining custom policy syntax

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