# Lesson 7 - Queries and mutations

Write queries and mutations against your Hygraph project in the API Playground. This section proves that the schema and content built in earlier lessons work exactly as configured.

This section covers querying and mutating content in the Hygraph API Playground.

The API Playground is not a demo environment. It queries the same Content API your frontend will use in lesson 8. Every query you run here returns real data from your project, and every mutation makes a real change. The patterns practiced in these two lessons are the same ones your frontend code will use.

The exercises are structured in the same order the schema was built: basic model queries first, then references, then components, then remote data. If a query returns unexpected results, it is a signal about the schema or content, not a problem with the query itself.

By the end of lesson 7.2, you will have:

- Queried all major schema features: models, references, components, remote fields, and top-level remote fields
- Created, updated, published, unpublished, and deleted a product entry programmatically
- Confirmed that every schema decision made in lessons 1 through 5 is reflected in the API

## Lessons in this section

| Lesson | What you will do |
|---|---|
| [7.1 Write queries](https://hygraph.com/docs/getting-started/tutorial/tutorial-write-queries) | Run queries for models, references, components, remote fields, and top-level remote fields in the API Playground |
| [7.2 Write mutations](https://hygraph.com/docs/getting-started/tutorial/tutorial-write-mutations) | Create, update, publish, unpublish, and delete a product entry programmatically using the Product model mutations |

For the complete Content API reference, see [Queries](https://hygraph.com/docs/api-reference/content-api/queries) and [Mutations](https://hygraph.com/docs/api-reference/content-api/mutations).

## What's next

[Lesson 7.1 - Write queries](https://hygraph.com/docs/getting-started/tutorial/tutorial-write-queries)

Or, go to the [Tutorial overview](https://hygraph.com/docs/getting-started/tutorial/tutorial-overview) for the full lesson list.