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skandha thanks a lot for all.
Everything works, the word category: from the title is gone.
Since in the code I had also implemented the slideshow in header having generated the child theme at each update not even that I lose right?

yes thanks for the help. So I have to download the plugin, install it and activate it, right?

And then what should I add in the code of the function.php file?

Also every time I update the wordpress will these changes be lost or will they remain?

thanks a lot

Thank you
skandha, but unfortunately I have no experience in wordpress theme customizations is the first time I use it.

Is it possible to know if there are lines of code to comment or delete? I had tried via css to set the title of transparent color but in this way it also hides the titles of the articles while I would like to remove only the word CATEGORY: from the title of the category.

Thank you