Avoid Appearance of Item-Lists

I have realized that there are some pages which can be accessed by typing the URL in the browser but which have no navigation pointed at them.

Actually I don't want these pages to be shown as they are not needed. I just don't know how to do that.

Link to the page:

www.vonschilcher.de

pages which are obsolete:

vonschilcher.de/index.php/item/1-empfehlungen
vonschilcher.de/index.php/item/3-herzlich-willkommen
vonschilcher.de/index.php/item/2-duesseldorfer-konzept
vonschilcher.de/index.php/itemlist/tag/sample
vonschilcher.de/index.php/itemlist/

Thanks in advance!

Regards

Bö.

That are SEF URLs and they are not 100% predictable so I give you exact rule. But you can use NON-SEF url that differ by query parameters and their values.

<you site>/index.php?option=com_content&view=article&id=23

will show you article with ID 23

<you site>/index.php?option=com_content&view=category&id=12

will show you category with ID 12

for this SEF urls you have to see how joomla will compose URL

OK. I know this. The problem is that I don't want these pages to exist at all.
I don't want a visitor to be able to enter the URL (or find it in Google) and get to this page.

These pages seem to be automatically generated by the K2 system, but I don't want these pages at all!
The content of these pages corresponds to the content in my three Items on the Start-Page…

That is kind of impossible to achieve. While articles are published joomla is disigned to think they should be accessible.