Research what's new, what improved, and what changed with C# from Godot 3.0 to 3.1.
Create an intro tutorial about setting up the Mono version of Godot and creating your first script. Something simple yet practical, like creating a KinematicBody2D with a sprite, using input, and physics process. Then send people to the getting started guide, where they can follow KidsCanCode's "Your First Game" tutorial.