Teach students the importance of clean code/architecture and testing. Even if they dont yet understand the more complex topics such as architecture, they should understand why quality is important and that software is a craft more than a science. You cant just apply principle X and insert design pattern Y and profit++. You actually have to think and constantly improve. AND TEST.
Think I would probably also cover things like build automation and continuous delivery. These are now important things for junior devs to know about going into companies.