diff --git a/knowledge base/cloud computing/aws/README.md b/knowledge base/cloud computing/aws/README.md
index 0f0ba97..c8d3c05 100644
--- a/knowledge base/cloud computing/aws/README.md	
+++ b/knowledge base/cloud computing/aws/README.md	
@@ -49,10 +49,12 @@ From [Using service-linked roles]:
 - [EC2]
 - [Services that publish CloudWatch metrics]
 - [Using service-linked roles]
+- [Best Practices for Tagging AWS Resources]
 
 ### Sources
 
 - [Constraints for tags][constraints  tag]
+- [What is cloudWatch]
 
 <!--
   References
@@ -65,7 +67,8 @@ From [Using service-linked roles]:
 [ec2]: ec2.md
 
 <!-- Upstream -->
+[best practices for tagging aws resources]: https://docs.aws.amazon.com/whitepapers/latest/tagging-best-practices/tagging-best-practices.html
 [constraints  tag]: https://docs.aws.amazon.com/directoryservice/latest/devguide/API_Tag.html
 [services that publish cloudwatch metrics]: https://docs.aws.amazon.com/AmazonCloudWatch/latest/monitoring/aws-services-cloudwatch-metrics.html
-[what is cloudwatch]: https://docs.aws.amazon.com/AmazonCloudWatch/latest/monitoring/WhatIsCloudWatch.html
 [using service-linked roles]: https://docs.aws.amazon.com/IAM/latest/UserGuide/using-service-linked-roles.html
+[what is cloudwatch]: https://docs.aws.amazon.com/AmazonCloudWatch/latest/monitoring/WhatIsCloudWatch.html
diff --git a/knowledge base/cloud computing/aws/cli.md b/knowledge base/cloud computing/aws/cli.md
index f352f5b..9226a52 100644
--- a/knowledge base/cloud computing/aws/cli.md	
+++ b/knowledge base/cloud computing/aws/cli.md	
@@ -31,6 +31,9 @@ export AWS_PROFILE='work'
 # Enable auto-prompt mode (like `aws-shell` does).
 aws configure set 'cli_auto_prompt' 'on-partial'
 export AWS_CLI_AUTO_PROMPT='on'
+
+# Clear cached credentials.
+rm -r ~'/.aws/cli/cache'
 ```
 
 </details>
@@ -50,6 +53,35 @@ aws deploy get-deployment-group --application-name 'batman' \
   --deployment-group-name 'production'
 
 
+# Access shells on containers in ECS.
+aws ecs execute-command \
+  --cluster 'clusterName' --task 'taskId' --container 'containerName' \
+  --interactive --command '/bin/bash'
+
+
+# Get information about the current user.
+aws sts get-caller-identity
+
+# List IAM users.
+aws iam list-users
+aws iam list-users --max-items '1'
+aws iam list-users --query "Users[?(UserName=='mario')]"
+aws iam list-users --query "Users[?(UserId=='AIDA…')].UserName"
+
+# Create IAM users.
+aws iam create-user --user-name 'luigi'
+
+# Create access keys.
+# Defaults to the current user if no user name is specified.
+aws iam create-access-key
+aws iam create-access-key --user-name 'luigi'
+
+# List access keys.
+# Defaults to the current user if no user name is specified.
+aws iam list-access-keys
+aws iam list-access-keys --user-name 'mario'
+
+
 # Show RDS instances.
 aws rds describe-db-instances
 aws rds describe-db-instances --output 'json' --query "DBInstances[?(DBInstanceIdentifier=='master-prod')]"
@@ -77,16 +109,6 @@ aws secretsmanager get-secret-value --secret-id 'ecr-pullthroughcache/github'
 
 # List SNS queues (a.k.a. 'topics').
 aws sns list-topics
-
-
-# Get information about the current user.
-aws sts get-caller-identity
-
-# List IAM users.
-aws iam list-users
-aws iam list-users --max-items '1'
-aws iam list-users --query "Users[?(UserName=='mario')]"
-aws iam list-users --query "Users[?(UserId=='AIDA…')].UserName"
 ```
 
 Subcommands not listed here are in their own service-specific article:
@@ -194,6 +216,7 @@ aws ssm start-session --target 'i-0123456789abcdef0'
 
 - [Improved CLI auto-prompt mode]
 - [Install the Session Manager plugin for the AWS CLI]
+- [Use an IAM role in the AWS CLI]
 
 <!--
   References
@@ -217,3 +240,4 @@ aws ssm start-session --target 'i-0123456789abcdef0'
 [improved cli auto-prompt mode]: https://github.com/aws/aws-cli/issues/5664
 [install the session manager plugin for the aws cli]: https://docs.aws.amazon.com/systems-manager/latest/userguide/install-plugin-macos-overview.html#install-plugin-macos-signed
 [quickstart]: https://docs.aws.amazon.com/cli/latest/userguide/cli-configure-quickstart.html
+[use an iam role in the aws cli]: https://docs.aws.amazon.com/cli/latest/userguide/cli-configure-role.html
diff --git a/knowledge base/kubernetes/README.md b/knowledge base/kubernetes/README.md
index 5be25db..ed2e175 100644
--- a/knowledge base/kubernetes/README.md	
+++ b/knowledge base/kubernetes/README.md	
@@ -616,6 +616,7 @@ Others:
 - [Kubernetes Troubleshooting - The Complete Guide]
 - [Kubernetes cluster autoscaler]
 - [Common labels]
+- [What is Kubernetes?]
 
 <!--
   References
@@ -703,3 +704,4 @@ Others:
 [pulumi]: https://www.pulumi.com
 
 [scaling k8s nodes without breaking the bank or your sanity - brandon wagner & nick tran, amazon]: https://www.youtube.com/watch?v=UBb8wbfSc34
+[what is kubernetes?]: https://www.youtube.com/watch?v=a2gfpZE8vXY