Positional typos
It seems every opening has some sort of positional typo or multiple. I had one that said to move to c6. It was actually g6. But good way to learn some decent openings.
Response from developer
Thanks for the feedback! I write all the comments myself and I’m usually very careful about notation errors, so I’ll review the lines again to make sure everything is correct. An update is coming very soon with a Hint button to clearly show which piece to move. I really appreciate you pointing it out!