updated document

Cloud_providers/AWS/basics.md

@@ -4,6 +4,8 @@
 
 - [AWS IAM](https://docs.aws.amazon.com/IAM/latest/UserGuide/reference_identifiers.html)
 
+- [AWS Troubleshooting IAM](https://docs.aws.amazon.com/IAM/latest/UserGuide/troubleshoot.html)
+
 - ARN
 - Amazon Resource Names (ARNs) uniquely identify AWS resources. We require an ARN when you need to specify a resource unambiguously across all of AWS, such as in IAM policies, Amazon Relational Database Service (Amazon RDS) tags, and API calls. 
 
@@ -17,3 +19,7 @@
 - update cluster config 
 
 ```aws eks update-kubeconfig --region <region-name> --name <cluster-name>```
+
+- IAM Policies
+
+```A policy is an entity in AWS that, when attached to an identity or resource, defines their permissions. AWS evaluates these policies when a principal, such as a user, makes a request. ```