targeting a specific net core framework for a new sln file using dotnet CLI code example

Example 1: dotnet core sloution

dotnet new sln --name my-solution
dotnet new [type] --name my-project 
dotnet sln add my-project/my-project.csproj
dotnet sln list
dotnet restore
dotnet build my-solution.sln

Example 2: dotnet new emty webapp

dotnet new web -o <Web app name>