It is possible to debug several projects from one solution simultaneously.
Solution Explorer -> solution properties -> Common -> Startup Project, select multiple to start. It takes more time to start, but worth it, if needed.
To convert dto into json, put into immediate window:
To install old .net core sdk/runtime, simply copy unpacked zip content folders (not dotnet.exe) to C:\Program Files\dotnet
Windows + Pause Shortcut to system settings. And environment variables settings is hidden behind Advanced settings button. I always forgetting, where it is.