> ## Documentation Index
> Fetch the complete documentation index at: https://www.checklyhq.com/docs/llms.txt
> Use this file to discover all available pages before exploring further.

# Learn Concepts and Best Practices

> Learn the fundamentals of modern monitoring and observability, with practical guides on Playwright, testing, and building more reliable applications.

Monitoring and Observability are key concepts when dealing with application quality and performance. Learn the fundamentals of modern monitoring and observability to help yourself and your team build better applications.

> [!NOTE]
>
> Whether you're just getting started or looking to advance your monitoring skills, our guides provide practical, real-world examples you can implement right away.

## Topics

> **[Playwright](https://www.checklyhq.com/docs/learn/playwright/overview.md)**
>
> Learn how to install Playwright and get started with your first script.

> **[Incident Response](https://www.checklyhq.com/docs/learn/incidents/)**
>
> Learn how to detect, handle, and repair incidents.

> **[OpenTelemetry](https://www.checklyhq.com/docs/learn/opentelemetry/)**
>
> Learn how to instrument your application with OTel and get deep insights into your full stack.

> **[Monitoring](https://www.checklyhq.com/docs/learn/monitoring/)**
>
> Learn the fundamentals of monitoring production services.

> [!TIP]
>
> **New to monitoring?** Start with [Monitoring fundamentals](https://www.checklyhq.com/docs/learn/monitoring/) to build a solid foundation, then explore Playwright for browser automation and testing.

## Popular Posts

> **[Playwright Authentication](https://www.checklyhq.com/docs/learn/playwright/authentication.md)**
>
> Learn how to handle authentication in Playwright and reuse credentials across tests.

> **[Request Interception](https://www.checklyhq.com/docs/learn/playwright/intercept-requests.md)**
>
> Learn how to control HTTP requests and responses.

> **[Basic Selectors](https://www.checklyhq.com/docs/learn/playwright/selectors.md)**
>
> Working with selectors is key for writing high quality scripts.


This documentation is built and hosted on [Mintlify](https://mintlify.com), a developer documentation platform.