Most of these pieces are pretty self explanatory, since you already know how to screw in a light bulb or use an extension cord. But we’ve still included a QR code / webpage for these “also included” pieces. This helps us itemize out the list of things you’ll need when you start a training video. For example, if you’re watching the training video showing setting up the illuminated white background, then you’ll need 4 of the light bulbs shown here. So of course we list that for you as well — whatever it takes to help you understand the assembly.