Update Index.md

docs/en/Index.md

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 # ABP Documentation
 
-ABP is an **open source application framework** focused on **ASP.NET Core** based **web application development**. It also supports developing other type of applications.
-
-Explore the navigation menu to deep dive in the documentation.
+ABP Framework is a complete **infrastructure** based on the **ASP.NET Core** to create **modern web applications** and **APIs** by following the software development **best practices** and the **latest technologies**.
 
 ## Getting Started
 
-The easiest way to start a new web application with the ABP Framework is to use the [getting started](Getting-Started.md) guide.
+* [Getting Started Guide](Getting-Started.md) is the easiest way to start a new web application with the ABP Framework.
 
-## Tutorials / Articles
+* [Web Application Development Tutorial](Tutorials/Part-1.md) is a complete tutorial to develop a full stack web application.
 
-### Web Application Development
+## Exploring the Documentation
 
-[Web application development tutorial](Tutorials/Part-1.md) is a complete tutorial to develop a full stack application using the ABP Framework.
+ABP has a comprehensive documentation that not only explains the ABP Framework, but also includes guides and samples to help you on creating a maintainable solution by introducing and discussing common software development principle and practices.
 
-### ABP Community Articles
+### Multiple UI & Database Options
 
-See also the [ABP Community](https://community.abp.io/) articles.
+ABP Framework has been designed to be **independent** of any UI Framework or Database Provider.
 
-## Samples
+The following **UI Frameworks** are officially supported and maintained;
 
-See the [sample projects](Samples/Index.md) built with the ABP Framework.
+* [MVC / Razor Pages](UI/AspNetCore/Overall.md)
+* [Blazor](UI/Blazor/Overall.md)
+* [Angular](UI/Angular/Quick-Start.md)
+
+And the following **Database Providers** are provided out of the box;
+
+* [Entity Framework Core](Entity-Framework-Core.md)
+* [MongoDB](MongoDB.md)
+* [Dapper](Dapper.md)
+
+### Architecture
+
+ABP offers a complete, modular and layered software architecture based on [Domain Driven Design](Domain-Driven-Design.md) principles and patterns. It also provides the necessary infrastructure to implement this architecture.
+
+* See the [Modularity](Module-Development-Basics.md) document to understand the module system.
+* [Implementing Domain Driven Design](Domain-Driven-Design-Implementation-Guide.md) document is an ultimate guide for who want to understand and implement the DDD.
+* [Microservice Architecture](Microservice-Architecture.md) document.
+
+### Infrastructure
+
+There are a lot of features provided by the ABP Framework to achieve real world scenarios easier, like [Event Bus](Event-Bus.md), [Background Job System](Background-Jobs.md), [Audit Logging](Audit-Logging.md), [BLOB Storing](Blob-Storing.md), [Data Seeding](Data-Seeding.md), [Data Filtering](Data-Filtering.md).
+
+### Cross Cutting Concerns
+
+ABP also simplifies (and even automates wherever possible) cross cutting concerns and common non-functional requirements like [Exception Handling](Exception-Handling.md), [Validation](Validation.md), [Authorization](Authorization.md), [Localization](Localization.md), [Caching](Caching.md), [Dependency Injection](Dependency-Injection.md), [Setting Management](Settings.md), etc. 
 
-## Source Code
+### Application Modules
+
+Application Modules provides pre-built application functionalities;
+
+* [**Account**](Modules/Account.md): Provides UI for the account management and allows user to login/register to the application.
+* **[Identity](Modules/Identity.md)**: Manages organization units, roles, users and their permissions, based on the Microsoft Identity library.
+* [**IdentityServer**](Modules/IdentityServer.md): Integrates to IdentityServer4.
+* [**Tenant Management**](Modules/Tenant-Management.md): Manages tenants for a [multi-tenant](Multi-Tenancy.md) (SaaS) application.
+
+See the [Application Modules](Modules/Index.md) document for all pre-built modules.
+
+## ABP Community
+
+### The Source Code
 
 ABP is hosted on GitHub. See [the source code](https://github.com/abpframework).
 
-## Want to Contribute?
+### Samples
+
+See the [sample projects](Samples/Index.md) built with the ABP Framework.
+
+### ABP Community Web Site
+
+The [ABP Community](https://community.abp.io/) is a website to publish articles and share knowledge about the ABP Framework. You can also create content for the community!
+
+### Want to Contribute?
 
 ABP is a community-driven open source project. See [the contribution guide](Contribution/Index.md) if you want to be a part of this project.