You can start learning at ASP.NET tutorial. You can learn the basics of .NET first, then to watch some videos, you can also try some quick examples.

C# 8.0 and .NET Core 3.0 – Modern Cross-Platform Development: Build applications with C#, .NET Core, Entity Framework Core, ASP.NET Core, and ML.NET using Visual Studio Code, 4th Edition
ASP.NET Core 3 and Angular 9: Full stack web development with .NET Core 3.1 and Angular 9, 3rd Edition
C# in Depth, 4th Edition

To learn more about data-access in .NET you could visit SQL tutorials. This is an important part of learning .NET.

You could also read some of the best programming books at ASP.NET books section.