Do you think Sololearn should add GDscript?

Question

GDscript is the main language of Godot a really good and powerful game making engine.

Answer 1

You can learn about Godot on their site and there should be plenty of tutorials on the web.
https://docs.godotengine.org/en/stable/getting_started/introduction/index.html

As GDscript is only relevant to the Godot engine, SL would need to integrate large parts of the engine, plus it would need to work in the SL mobile app.