# Core Concepts

- [Account Onboarding Procedure](/coti-documentation/build-on-coti/core-concepts/onboard-user.md)
- [Private Data Types](/coti-documentation/build-on-coti/core-concepts/secure-data-types.md)
- [Supported Operations on Private Data Types](/coti-documentation/build-on-coti/core-concepts/secure-operations-and-gas.md): Secure operations are supported via our gcEVM extension, which is implemented through a set of precompiled contracts.