ASP.NET is an open-source server-side web application framework designed for web development to produce dynamic web pages. It was developed by Microsoft to allow programmers to build dynamic web sites, web applications and web services.
It was first released in January 2002 with version 1.0 of the .NET Framework, and is the successor to Microsoft’s Active Server Pages (ASP) technology. ASP.NET is built on the Common Language Runtime (CLR), allowing programmers to write ASP.NET code using any supported .NET language. The ASP.NET SOAP extension framework allows ASP.NET components to process SOAP messages.
We have covered topics like installation, introduction, creating first hello world application, dynamic website, connecting with database, presenting dataset, Forms, Web forms, Postbacks, Data Binding Expression, Variables, Loops, Functions, creating web control, Registering user control, validation control, controlling validation messages etc.
So Most of the topics needed to develop web application are covered. Still Asp.net is very active technology. It is updated often so you need to be staying updated. You can get latest update about it from Microsoft website. You can also learn some function and more about asp.net from http://www.w3schools.com/aspnet/ website.