USB-C display adapters (HDMI, DisplayPort) are a wonderful thing when they work correctly. I prefer this solution to the docking ports on old bulky laptops. A symptom is USB-C adapter works on one laptop, but not on another almost identical laptop model. Symptoms include not being detected by the operating system, to showing a black screen, or very low resolution.
The solution seems to be to stick with expensive OEM display adapters, or at least long established brands. The temptation of a cheap adapter can quickly turn to frustration or botched presentations. Another thing to watch for is cheap adapters may fail intermittently when using more than one high bandwidth feature. For example, using Gigabit Ethernet and HDMI on the cheap USB-C adapter simultaneously may fail intermittently during a conference call or teaching a class, which can be frustrating.