Hi,
This subforum exists to ask for help and to help. No need to apologise.
Regarding your problem, code is just text. If keyshorts do not work in your script editor, you could simply type the code. I’ve taken a brief look at your script, and it looks fine to me. You should be able to call StartCrashSequence in other methods within the CollisionHandler class.
To fix the issue with VS Code, please follow the instruction on this website and make sure all required extensions are installed: https://code.visualstudio.com/docs/other/unity
If the issue persists, please check the console of VS Code (not Unity!). If the .NET Framework 4.7.1 (Developer Pack) is mentioned there, download and install it from the official Microsoft website. Here is the link: https://dotnet.microsoft.com/download/dotnet-framework/net471
I hope this helped.
See also: