What should I learn asp. Net or asp. Net core ? Which one is best

Answer 1

https://www.c-sharpcorner.com/article/asp-net-or-asp-net-core-what-to-choose/

Answer 2

Go for .Net 5.0 (.Net Core), in the near future .Net 6.0

https://docs.microsoft.com/en-us/dotnet/core/dotnet-five

.Net Framework is still supported but probably will not receive mayor update anymore.