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+# App Development Overview<a name="EN-US_TOPIC_0000001123678714"></a>
+
+This document provides guidance on how to develop apps through the JS APIs provided by OpenHarmony on the standard system.
+
+To get a glimpse of the basic methods for developing apps, see  [Quick Start](quick-start/Readme-EN.md). For details about the API list and references, see  [JS Reference](js-reference/Readme-EN.md).
+
+To better understand frequently-used modules, see the development guidelines for  [UI](ui/Readme-EN.md),  [media](media/Readme-EN.md), and  [networks and connectivity](connectivity/Readme-EN.md).
+
+For details about the principles and basic information of each subsystem, see the related README file in  **docs/en/readme**.
+