I've been playing with Blazor Client Side and I have some questions about the basic project setup.
Should I be committing everything in \Client\wwwroot\css\?
It contains two libraries
I would imagine they are managed through Nuget packages, which means it should pull the version specified when you build?
How does this all work?
No these are static directories/files unrelated to any Nuget Packages. They are just what comes with the template for CSS formatting. So don't .gitignore them. There's a short article here covering CSS in Blazor which shows you one way of setting up CSS in Blazor using SASS and covers Component based Scoped CSS.