What AL Programming Concepts Should an Aspiring Business Central Developer Practice?

An aspiring Dynamics 365 Business Central Developer should focus on AL concepts that directly map to real-world ERP customization rather than learning syntax alone. The most important areas include tables, pages, extensions, codeunits, reports, queries, events, interfaces, permissions, and APIs. A developer should understand how to extend standard Business Central functionality using table extensions and page extensions, while avoiding unnecessary modifications to the base application. Event-driven development is particularly important because event subscribers allow custom logic to be introduced without tightly coupling the solution to standard Microsoft code. Key areas to practice AL syntax, data types and collections Tables, table extensions and relationships Pages and page extensions Codeunits and reusable business logic Events and event subscribers Reports and report extensions Queries and data retrieval Interfaces and dependency management Permission sets and security Web services and REST APIs JSON and external integrations Error handling and transaction management Automated testing with AL test codeunits Real-world practice A strong portfolio project could be an Employee Expense Management solution: Employee → Expense Entry → Approval Workflow → Finance Review → Posting → Reporting This allows a developer to practice tables, pages, codeunits, approval logic, events, permissions and reporting in one realistic scenario. Career tip: Business Central developers become valuable when they can translate business requirements into maintainable AL extensions—not simply write AL code. Recommended learning path: Build progressively from AL fundamentals → extensions → events → integrations → testing → enterprise Business Central development.