By now you should be getting quite proficient at hand cutting joints; they should have minimal gaps, be secure when assembled, and look uniform. Now lets move onto some even more challenging joinery that will be essential to the upcoming projects in the school.
A mitred dovetail joint is not only a beautiful way to finish off a corner, but is also a great choice of joint when it comes to hiding grooves or rebates within a carcass. This is because it negates the need to produce stopped grooves, as explained in this lesson.
An angled dovetail isn't too dissimilar to a traditional through dovetail, however the marking out and material preparation requires a lot of thought. This joint is a great way to easily put an alternative twist on an otherwise square project.
The Collins Complete Woodworkers Manual helped me tremendously when beginning woodworking and I've been recommending it to my viewers and students for years. I'm yet to hear a bad review from them.