How to install dotnet (.net, asp.net) core SDK 3.1 on Windows 10

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How to download and install dotnet or .net core SDK 3.1 on Windows 10/8/7 - 64 bit/32bit.
How to create dotnet MVC framework webapp on Windows 10.

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Download .net SKD from this link
https://dotnet.microsoft.com/download/dotnet-core
https://dotnet.microsoft.com/download/dotnet-core