Experts are saying that, as the technical complexity of our world increases (think smartphones, smart appliances, autonomous vehicles, VR and AR), there is an increasing gap between those who have knowledge (the engineers and computer scientists) and the rest of the world who are increasingly becoming slaves. Cars are a perfect example. As recently as 20 years ago, many people did much of their own maintenance on their cars. But that's becoming rarer and rarer as we move from "simple" combustion engines and rotary window controls to computer-controlled everything. Nowadays, if there is anything wrong with our cars, most people have to call the experts. That same complexity is now appearing in pretty much everything we use. The world is reliant on the experts.
All of you have used Arduinos before. They are perfect for practicing how to become experts rather than slaves to technology. You learn more programming (and the C programming language is now considered to be the most important language in the world), you learn to make systems that can react to its environment, and you learn to troubleshoot these complexities. And hopefully you have fun doing it.
Here are the major learning goals: