docs(guide): introduce module usage (#3195)

docs/guide/index.md

@@ -37,6 +37,18 @@ yarn add @faker-js/faker --dev
 
 :::
 
+## Faker Modules
+
+Faker has three types of modules:
+
+- Modules for basic datatypes: [`datatype`](/api/datatype), [`date`](/api/date), [`number`](/api/number) and [`string`](/api/string)
+- Topic specific modules, such as [`animal`](/api/animal), [`food`](/api/food) and many more
+- Lastly, the [`helpers`](/api/datatype) module, with various utility methods to use with your own data (or data generated by other Faker methods)
+
+For a full list of modules, go to our [Api Search](/api/) page.
+
+If you would like to know how to use Faker, go to our [Usage Guide](/guide/usage) page.
+
 ## Community
 
 If you have questions or need help, reach out to the community via [Discord](https://chat.fakerjs.dev) and [GitHub Discussions](https://github.com/faker-js/faker/discussions).