# Helpers

- [Nulls](/platform-documentation/catalog-2.0-docs/project-data/assets/nodes/helpers/nulls.md)
- [Model References](/platform-documentation/catalog-2.0-docs/project-data/assets/nodes/helpers/model-references.md): Model nodes allow us to reference other model assets inside a Scene or Model Asset for a nesting setup.
- [Connectors](/platform-documentation/catalog-2.0-docs/project-data/assets/nodes/helpers/connectors.md)