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Welcome to the Drupal developer's documentation. Here are some topics to get you started:
- Module system (Drupal hooks)
- Database abstraction layer
- Menu system
- Form generation; see also the Form API Reference
- File upload system
- Field API
- Search system
- Node access system
- Theme system
Links to additional information:
- Examples project, which contains sample module code useful for module developers
- Drupal API pages, with in-depth articles on many of the Drupal 7 APIs
