There is a comprehensive set of additional feet included, as well as a collection container. I don't know if there is a code for an eBook, but a physical manual is included.

Thank you all for the good answers!

I have forgotten something else: You can find very good videos about the machine online. Highly recommended, for example, is "Gritzner 788 Overlock sewing course with ❤️! Create perfect sewing results yourself" This video is from Gritzner itself.

The e-book is not included. After reading online, however, there is not much more in it than in the instruction manual or, according to these reviews, the photos in this e-book are not good. This machine, which I now have myself, is the model in which the light bulb has been replaced by an LED light, but does not yet have a thread cutter (as is usual with sewing machines, for example). The model with the built-in thread cutter has been on sale since the end of 2023. As I would like to have a thread cutter, I went looking for one (you could theoretically use the machine's knife or scissors to help, but if you are used to cutting the thread directly on the machine, it is practical to have a thread cutter on the overlock as well). A thread cutter for the Glitzer 788 can be purchased from Nähfox Germany for approx. 13 euros.

There are 5 additional feet, a waste bin and a user manual.