config - configuration files
db - DB-related files (models, migrations, seeds)
services - business logic and integrations
utils - general utilities
graphql - GraphQL API files and modules
middleware - middleware (almost like in Express) that run along every request
middleware/permissions.js - place where we can configure who can do what
modules - place for our API schemas and resolvers
scalars - custom GraphQL types
utils - graphql-related utils