# IntelliJ Platform SDK

> For the complete documentation index, see [llms.txt](https://plugins.jetbrains.com/docs/intellij/llms.txt).

IntelliJ Platform SDK

Extend the IntelliJ Platform by creating plugins, custom language support, or UI themes.

- [Quick Start Guide](plugins-quick-start.html): Basics of working with the IntelliJ Platform and creating plugins.
- [The IntelliJ Platform SDK](about.html): Introduction and overview of contents.

## Get started

- [Introduction to Plugin Development](developing-plugins.html): Get started building IDE plugins.
- [Developing a Theme](themes-getting-started.html): Customize the IDE appearance.

## Explore and Learn

- [Getting Help](getting-help.html): Join our community of plugin developers, ask questions and provide feedback.
- [Explore the IntelliJ Platform API](explore-api.html): Strategies and tools for exploring the API.
- [Useful Links](useful-links.html): Useful tooling, plugins and repositories.
- [Learning Resources](learning-resources.html): Articles and webinars about plugin development.
- [JetBrains Platform Blog](https://blog.jetbrains.com/platform/): All about plugin and extension development for JetBrains products.
- [Busy Plugin Developers - Playlist](https://www.youtube.com/playlist?list=PLQ176FUIyIUZRWGCFY7G9V5zaM00THymY): YouTube playlist with recorded webinars.

## Staying up to date

- [Content Updates](content-updates.html): Latest updates to the documentation.
- [Marketplace Developer News](https://jb.gg/mp-updates): Subscribe to receive news and announcements.

## Tracking API Changes

- [Compatibility Tooling](verifying-plugin-compatibility.html): Using Plugin Verifier and IDE features.
- [Incompatible API Changes](api-changes-list.html): Known breaking changes.
- [Notable API Changes](api-notable.html): Notable changes and new features.

## Tools

- [IntelliJ Platform Explorer](https://jb.gg/ipe): Explore extensions and listeners in open source plugins.
- [Plugin Ideas](https://plugins.jetbrains.com/plugin-ideas/): Browse and vote on suggestions for new plugins.