What language is being taught for the learn asp.net and build web apps with asp.net courses

Hi,

I saw that razor pages is being taught for asp.net. What version of .net is being taught on codecademy. is it asp.net, asp.net core, is it .net 5 or .net 6? https://www.codecademy.com/learn/paths/build-web-apps-with-asp-net.