Is it possible to export categories and products from DNN webshop? I really cant fint a solution.

Hi and welcome,
There are multiple store modules available for Dnn (both free and commercial), so first we need to know which one you are using. You can find that in the module settings just above the module title.

We currently have a team of community members working on bringing those module back to life. The store module was not maintained for a couple years, but the current repository is at https://github.com/lepigocher/DNNStore and should soon move to https://github.com/dnncommunity

As far as I know, this module supports exporting, you should see that in the module actions in the same menu where the module settings are. That will generate an XML file containing the module content. Also, you have one export for the products control and another export for the categories control.