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-# Step Function
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+# Step Function
+{: .no_toc }
+
+AWS Step Functions is a visual workflow service that helps developers use AWS services to build distributed applications, automate processes, orchestrate microservices, and create data and machine learning (ML) pipelines. [aws]
+{: .fs-6 .fw-300 }
+
+## Table of contents
+{: .no_toc .text-delta}
+
+1. TOC
+{:toc}
+
+## What is a Step Function?
+
+...Workflow, Lambda, Serverless, Logic, Sync/Async, ASL, Mapping, Predefined actions
+
+## How to test Step Functions?
+
+- [ ] Testing the ASL
+- [ ] Local dynamic testing
+- [ ] Retry, Error handling, Logic
+
+## Let's see in action!
+
+### Sample stack
+
+- [ ] Find or create a simple stack
+
+### Testing the sample stack
+
+- [ ] CDK tests
+- [ ] ASL tests
+- [ ] Dynamic tests
+- [ ] Retry and Error handling
+
+## More to read
+
+1. TBD
+
+[aws]: https://aws.amazon.com/step-functions/
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