If, after watching Alan's videos (particularly those that pertain to how you might use a scope), you decide to get one yourself, one of the best First Uses of such a device is to look at various signals on a simple, functioning radio.
If you have a QCX from QRPLabs, you're in luck. Hans G0UPL has written a 25-page guide to troubleshooting the QCX. Throughout those pages, he has placed images of oscope traces expected to be seen at various points in the transceiver along with descriptions of how those traces were obtained: oscope settings, circuit/rig prerequisites, etc
|From Hans' troubleshooting guide|
It is an excellent tutorial, not just on troubleshooting the QCX, but on how to use an oscope and interpret its results - lessons that can be applied to any transceiver.