Update Overall.md

docs/en/UI/Blazor/Overall.md

@@ -1,8 +1,46 @@
 # Blazor UI: Overall
 
-## Getting Started
+## Introduction
 
-You can follow the documents below to start with the ABP Framework and the Blazor UI:
+[Blazor](https://docs.microsoft.com/en-us/aspnet/core/blazor/) is a framework for building interactive client-side web UI with .NET. It is promising for a .NET developer that you can create Single-Page Web Applications using C# and the Razor syntax.
 
-* [Get started](https://docs.abp.io/en/abp/latest/Getting-Started?UI=Blazor) with the Blazor UI for the ABP Framework.
+ABP provides infrastructure and integrations that make your Blazor development even easier, comfortable and enjoyable.
-* [Web Application Development Tutorial](https://docs.abp.io/en/abp/latest/Tutorials/Part-1?UI=Blazor) with the Blazor UI.
+
+This document provides an overview for the ABP Framework Blazor UI integration and highlights some major features.
+
+### Getting Started
+
+You can follow the documents below to start with the ABP Framework and the Blazor UI now:
+
+* [Get started](../../Getting-Started.md) with the Blazor UI for the ABP Framework.
+* [Web Application Development Tutorial](../../Tutorials/Part-1.md) with the Blazor UI.
+
+## Modularity
+
+[Modularity](../../Module-Development-Basics.md) is one of the key goals of the ABP Framework. It is not different for the UI; It is possible to develop modular applications and reusable application modules with isolated and reusable UI pages and components.
+
+The [application startup template](../../Startup-Templates/Application.md) comes with some application modules pre-installed. These modules have their own UI pages embedded into their own NuGet packages. You don't see their code in your solution, but they work as expected on runtime.
+
+## Dynamic C# Client Proxies
+
+TODO
+
+## Theme System
+
+TODO
+
+### Base Libraries
+
+TODO
+
+### Layout Parts
+
+TODO
+
+## Global Styles & Scripts / Bundling & Minification
+
+TODO
+
+## Customization
+
+TODO