add overview

Signed-off-by: Wyllie Fang <wylliefang@gmail.com>

Author: Vincamine

content/en/cloud/academy/_index.md

@@ -7,4 +7,16 @@ categories: [Academy]
 tags: [Academy]
 ---
 
-Academy: https://cloud.layer5.io/academy
+Academy: https://cloud.layer5.io/academy
+
+[Layer5 Academy](https://cloud.layer5.io/academy/) is a platform that provides a comprehensive learning experience for anyone beginning their journey into cloud-native infrastructure or advancing along that path.
+
+It organizes content into three key formats:
+- **Learning Paths**: Guided sequences of courses that break down complex topics into manageable modules.
+- **Challenges**: Practical exercises that focus on solving specific problems, often structured in a competitive or scenario-based format.
+- **Certifications**: Formal assessments that validate professional skills and provide recognized credentials.
+
+Roles Served
+- **[Learners](https://docs.layer5.io/cloud/academy/using-the-academy/)**: Engage with Learning paths, challenges, and certifications to build and validate cloud-native skills.
+- **[Content Creators (Instructors)](https://docs.layer5.io/cloud/academy/creating-content/)**: Develop and publish structured materials, and manage the overall learning experience.
+- **[Platform Developers](https://docs.layer5.io/cloud/academy/platform-development/)**: Extend and maintain the Academy platform, enabling new features and integrations.