# 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**.
