Don't know what it means when one camera shoots 8-bit photos while another one shoots 10-bit? Here's a helpful primer by ZY Productions that will bring you up to speed on the basics of bit depth in less than 3 minutes.
If you use an interchangeable-lens camera, your camera probably has a weird symbol that looks like a circle with a line through it. If you've never learned what this symbol is, here's a 2-minute video by ZY Productions that explains the film/sensor plane indicator.
Most photographers rely heavily on the capabilities of autofocus systems in DSLR cameras, but knowing how they actually work is something that even experienced photographers may not have learned. Here's a 4-minute video by ZY Productions that helps decode the mystery of DSLR autofocus by explaining the technical details behind it.
DSLR cameras often have a little depth of field preview button beside the lens mount. This 3-minute video by ZY Productions revisits the basics of a DSLR camera and looks at how this handy button works, as well as some lesser-known things to consider.