# Documentation for development > [!WARNING] > TODO: This document is a work in progress. Please help us improve it! See those other useful documents as well: - [knowledge.md](knowledge.md) for high-level architecture and design decisions. - [README.md](../backend/api/README.md) for the backend API - [README.md](../backend/email/README.md) for the email routines and how to set up a local server for quick email rendering - [README.md](../web/README.md) for the frontend / web server - [testing.md](testing.md) for testing guidance and direction - [database-schema.md](database-schema.md) for database schema and migrations - [performance-optimization.md](performance-optimization.md) for performance best practices - [database-connection-pooling.md](database-connection-pooling.md) for database connection management - [troubleshooting.md](troubleshooting.md) for resolving common development issues - [profile-fields.md](profile-fields.md) for adding new profile fields - [internationalization.md](internationalization.md) for adding new languages