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MB-820 Field Guide for Microsoft Dynamics 365 Business Central Developer

The JITA MB-820 Field Guide is a professional study resource for Microsoft Dynamics 365 Business Central Developer. It is built to teach how the subject works, how decisions change when facts change, and how to verify an outcome rather than memorize isolated answers.

View MB-820 certification resources MB-820 Exam Preparation Guide
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JITA Learning · Microsoft · Field Guide

MB-820 · Microsoft Dynamics 365 Business Central Developer

Build working judgment for Dynamics 365 Business Central development.

What you should expect

Build working judgment for Dynamics 365 Business Central development.

This Field Guide develops a working mental model of Dynamics 365 Business Central development. You will connect build and extend AL tables, pages, enums, codeunits, reports, queries, and application objects, design extension-safe events, interfaces, permissions, and application behavior, create APIs, OData actions, web services, and external integration paths, and apply testing, source control, packaging, deployment, upgrade, and lifecycle practices. You are not just memorizing feature names; you are learning what owns the requirement, what can fail, and how to verify the outcome.

What you will learn
  • build and extend AL tables, pages, enums, codeunits, reports, queries, and application objects
  • design extension-safe events, interfaces, permissions, and application behavior
  • create APIs, OData actions, web services, and external integration paths
  • apply testing, source control, packaging, deployment, upgrade, and lifecycle practices
  • recognize why one technically plausible alternative loses under the stated requirement
  • apply Changed Fact reasoning and verify the design or implementation through operational evidence
Decision skills you will practice
  • identify the governing requirement
  • compare the nearest plausible alternative
  • apply Changed Fact reasoning
  • trace prerequisites, dependencies, and failure paths
  • verify configured state, effective state, runtime outcome, and negative-path evidence
Who this is for

AL developers extending Business Central with tables, pages, reports, APIs, integrations, permissions, testing, and telemetry

Use this when you need to learn the architecture, mechanics, dependencies, tradeoffs, failure paths, and verification logic behind the certification.
Decisions you will learn to distinguish
  • table/page extension vs standalone custom object
  • API/OData integration vs internal AL processing
  • functional extension issue vs performance/telemetry or deployment issue
Why JITA is different

Microsoft explains the platform. JITA teaches the decision.

Microsoft Learn explains the services, features, and documented behavior that support Dynamics 365 Business Central development. JITA connects those capabilities into decisions: what owns the requirement, what the nearest alternative is, what changes when one fact changes, and what evidence proves the implementation worked.

How to choose: Use the Field Guide to build understanding. Use the Exam Preparation Guide to test whether that understanding survives exam-style decisions.