# Lesson 2.4: Lesson 2 Summary

Welcome to Lesson 2.4! We'll be reviewing and reinforcing the concepts you learned in the previous lesson. Let's get started by refreshing your memory on the material you've already covered.

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{% tab title="Concepts Recap" %}
Congratulations on finishing all the lessons! Now, you are able to:

* Explain what validators are.
* Differentiate between typed and untyped scripts.
* Execute and inspect validators' code to identify code issues.
* Employ built-in and custom data types.
* Use the cardano-cli to interact with validators.
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{% tab title="Additional Resources" %}
To learn more about the topics covered in this lesson, we encourage you to review the following resources:

* [Writing basic validator scripts](https://plutus.readthedocs.io/en/latest/tutorials/basic-validators.html)
* [Plutus language changes](https://plutus.readthedocs.io/en/latest/reference/cardano/language-changes.html)
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## Collaborate with the Pioneers Community

Remember that you can interact with the participants of the PPP through the [IOG's technical community on Discord](https://discord.gg/inputoutput) by joining the channels under the Plutus Pioneers category.

If during the program you have questions about Plutus, we invite you to share them at [Cardano Stack Exchange (CSE)](https://cardano.stackexchange.com/) by adding the `plutus-pioneer-program` tag to your question. The IOG's Education Team members will monitor these questions to support your learning journey. Whenever you share a question at CSE, you're helping to build up the Cardano and Plutus development knowledge base.

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This work is licensed under a [Creative Commons Attribution 4.0 International License](http://creativecommons.org/licenses/by/4.0/).

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