heh - that's a pretty tall order man. However, there are a few decent courses that are not provided by Shopify directly (though I think some of them are made by Shopify Staff and developers). In my most humble opinion; I've found them to be far more helpful than anything I've found here. I feel like such a jerk saying that; but it's true. Udemy and FreeCodeCamp are but two to take a look at.
The Shopify courses you'll find in your partner's profile are extremely basic and a few of them left me even more confused than when I started. Don't get me wrong, Shopify is an extremely powerful and all around awesome platform to develop on; but god help them if they ever get into education.
However, the one native Shopify resource that I do highly recommend flipping through is their blog. It actually does have a ton of useful information if you're just getting into Shopify Development. It has a lot of rich content sorta scattered throughout; so you'll have to kinda "wikipedia" through click by click.