there is no project.json, global.json ... etc on .NET Core Solution with Visual Studio 2017

The .NET Core was changing its internals with a slightly fast pace (although it seems it has settled down now), thus making many of the tutorials out there obsolete. Since mid-2016, the project.json has been dumped in favor of "your-app-name".csproj file.

If you are following a tutorial or a book, then for anything you are supposed to write in the project.json, you must now write it in the csproj file with a slightly different format.

If I have to mess with project.json when following tutorials, I use this official migration guide.

The .NET Core (and other teams) have decided to drop project.json and go back to MSBuild and *.csproj.

So there is no project.json nor global.json in .net core stack any more.
The alternative for project.json is *.csproj and for global.json is *.sln.

Old csproj to new csproj: Visual Studio 2017 upgrade guide
for more info

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Update: (based on Stajs comment)
global.json is still in the stack, but neutered to only defining the SDK version.