# Usage

Use the following guides based on how you want to use the Tonomy SDK

* [Login](https://docs.tonomy.io/build-web4-apps/usage/single-sign-on)
* [User Data and Logout](https://docs.tonomy.io/build-web4-apps/usage/usage)
* [Sign Verifiable Credentials](https://docs.tonomy.io/build-web4-apps/usage/sign-verifiable-credentials)
* [Server Authentication](https://docs.tonomy.io/build-web4-apps/usage/server-authentication)
* [Smart Contracts](https://docs.tonomy.io/build-web4-apps/usage/smart-contracts)
* [Send P2P Messages](https://docs.tonomy.io/build-web4-apps/usage/send-p2p-messages)