While there are no strict requirements, several third-party modules commonly enhance Odoo 16 Community Edition:

1. Website Builder: Customize and manage your company website directly within Odoo.
2. Inventory Management: Track stock movements, serial numbers, and batches with modules like "Stock Management."
3. Accounting and Finance: Access advanced accounting features, including multi-currency support and integration with payment gateways.
4. CRM: Manage customer interactions, leads, and sales processes efficiently.
5. E-commerce Integration: Seamlessly integrate with platforms like Shopify for online store management.
6. Project Management: Utilize task tracking, Gantt charts, and time tracking for project management.
7. Human Resources: Manage employee data, attendance, leave, and performance evaluations.
8. Document Management: Organize and share documents for improved collaboration.

Evaluate your specific needs and choose modules accordingly, considering compatibility, support, and community reviews.