# All Guides & Tutorials

Quickly get started with **our 5-minutes tutorials**:

💬 **Sign in with email/phone number:** Authenticate using a Magic Link or Verification Code. [Learn More  →](/features/verify-email-phone.md)

* [HTML Quickstart](/quickstart-guides/html-magic-link-with-email-and-phone.md)
* [React Quickstart](/quickstart-guides/react-magic-link-with-email-and-phone.md)
* [Next.js Tutorial](https://blog.cotter.app/passwordless-login-with-email-and-json-web-token-jwt-authentication-with-nextjs/)
* [Angular Tutorial](https://blog.cotter.app/angular-send-email-sms-and-whatsapp-verification-code-for-new-users-worldwide/)
* [Webflow Tutorial](https://blog.cotter.app/integrate-cotter-magic-link-to-webflow-in-less-than-15-minutes/)

🔐 **Sign In with Device on Mobile Apps:** Authenticate users based on the ownership of a device. [Learn More  →](/features/passwordless-login.md)

* [React Native Quickstart](/quickstart-guides/react-native-quickstart.md)
* [Flutter Quickstart](/quickstart-guides/flutter-sign-in-with-device.md)
* [iOS Quickstart](/quickstart-guides/ios-quickstart.md)

🧬 **Sign in with WebAuthn:** Authenticate users using TouchID/Windows Hello from your website. [Learn More  →](/features/sign-in-with-webauthn.md)

* [React Quickstart](/quickstart-guides/react-webauthn.md)


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# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://docs.cotter.app/quickstart-guides/all-guides-and-tutorials.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.