Can there be a Unity C#

Question

Now that would be cool because they don't have a direct lesson on the scripting structure,

Answer 1

As much as I wish it were a thing, I don't think Unity lessons will come. There is likely to much to go through for Sololearn to want to have to worry about. Such as, Unity's interface, libraries, components, etc..
Plus, the community would then want to see things from other engines like Unreal. What makes Unity the special one for this platform? Or lessons on 3d modelling programs for the projects like Blender.

This is just to large of a scope for Sololearn to handle. What you learn in the C# course can be applied into Unity's C# scripting. That's the main information Sololearn brings, the fundamentals that can be applied elsewhere.

Unity has it's own amazing documentation and tutorials. I can assure you they cover scripting within them.
They're very helpful!!
https://unity3d.com/learn/tutorials