learn(tf) : learned terraform taint command

AWS Automation/Readme.MD

@@ -6,4 +6,10 @@
 
 - Security Group 
 
-- Assign Security Group to Instances.
+- Assign Security Group to Instances.
+
+
+# Terraform Taint 
+- Terraform marks resources as taint, which means when running `terraform apply/plan` it recreates the resource rather than modifiying it. 
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+