What city does your friend live in? How good are his Japanese reading skills?
That video is a good overview of garbage in Japan, but the local details are important, too. For example, where I lived in Aichi Prefecture in the naughties, there were no blue nets per the video, and the non-burnable garbage rules were quite complex. We had these burlap-type reusable bags that were color-coded for the different types of garbage, and each color had its own schedule for pickup.
There certainly was no large dumpster at the apartment building!
As
@mdchachi mentioned, the municipality will have a guide. That is the best resource. If the apartment building has a manager (mine didn't), they would be another good resource.