i cant use intellisense in vscode with unity. i originally had .net sdk v7 but in assembly-csharp.csproj it said v4.7.1 so i downloaded that but now my c# extension says no version of .net core sdk found and my intellisense still doesnt work. i downloaded .net core v2.1 but it didnt work.
VSCode is not supported (anymore).
Please use the Visual Studio Community version that the Unity Hub recommends to install along with the Unity editor version. Go to the Installs tab and click on the gear icon, choose Add Modules and select the Visual Studio item at the top.