Content-Items are re-usable
Whenever you add new content-items the system actually does 2 things
- A new content-item is created
- The content-item is assigned to this page / place so that it's displayed here
It does it like this so that you can re-use the content in other places as well. You might want to re-use a piece of information - like your contact-details - in another page. Or if you have a list of employees, you way want to use some of them again on other pages.
When you re-use existing content-items the system actually just does 1 thing
- The existing content-item is assigned to this page/place and displayed here
Removing Content-Items doesn't Delete them
A common question is "does delete really delete?". The answer is: usually not. Since the items can be re-used (see above), a remove-operation will only remove it from that place where you used it. So removing the secretary from the sales-employees-list will not delete the secretary, but just remove him/her from that list. You can always add him/her again.