I read the part about Really responsive images, very nice and responsive making her even better, a question about this.
With background images works the same here as I at breakpoints klenere images read-in, or can not?
And when an image is none put it or read or not?

I'm sorry, Ger, don't understand what you mean. Could you please either rephrase your question, or maybe if you speak German, write it in German, or otherwise write in Dutch, and we'll use Google translate.

I read the part about Really responsive images, very nice and responsive making it even better, a question about this.
With background images, it works then the same as I-read smaller images at breakpoints, or can not?

Basically yes.
It depends on in which area the background image to be displayed.
You have three possibilities:
cover
contain
and percentage data.
For an accurate answer, it would be important to know what you exactly want.