Why wont unity scripts inherit MonoBehaviour class or call debug.log or any custom made classes?

I’m new to unity, I’ve created a project, created a new empty game object and attached a script to it, however I’m unable to even call Debug.log, the class is not recognised and I cannot create an object of any classes which I’ve made in the asset folder, the script won’t find either…
can anyone help…

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okay, solved it, had to follow the steps at
Unity - Manual: Visual Studio C# integration (unity3d.com)

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