You have learnt the basic skills of marking out, cutting and refining joints as well as completed a dovetail box. So it's now time to step up the game and begin cutting some more challenging joinery in preparation for our upcoming projects.
This joint is a beautiful way of joining a corner as it is essentially an exposed mortise and tenon. In addition, the contrast between side grain and end grain is stunning.
Now that you have learnt how to cut a bridle joint, you next need to focus on learning how to cut a mortice and tenon joint. This will be used for frame and panel doors as well as carcass construction in later projects.
Another essential joint to be able to master. This joint is generally used on drawer fronts where you want to retain the advantages of a through dovetail, yet keep it somewhat hidden.
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.