Hi Frieoud
It depends on whether you are interested in canning in particular or just the machine. The machine is self-explanatory. You turn the temperature control to the right temperature and set the time duration and that's it.
If you are interested in preserving in particular, it is best to look at the relevant websites, e.g.
https://weckenonline.eu/verschil-i...
There is information about the differences between the various machines. But the site also has information on how to preserve food and recipes. You may have to google further.

Fortunately self-explanatory. Try it out 😊