Set it up like a tree.
First, teach people the core basics of using the editor, making a new project, installation and all that.
From that start, they can then choose a path and each path breaks up into different paths.
Obviously, on the game path, you would make a third person character that can walk, run, jump with WASD/Mouse. From there, people can dig deeper into gameplay, maybe go first person, or explore combat, or enter the AI path, the animation path, or the sound path or the environments path. In the environments path, they can go for the lighting path, or the landscaping path.
Different paths would of course combine later on, so if you are in a team, you can focus 100% on your task, if you are an indie, you can pick and choose what is required for your goal.
And please, do consider allowing the community to discuss the content, either underneath it, or on a hub link, because some will require things in a different way, may not understand everything or have improved solutions after tweaking things.