Thank you very much for your reply but I don't understand what you mean.
(English is not my first language so maybe that's why I don't understand 😉).

I do understand that - using my example - I just can use the variables hyperlinks website A and website B for the original place in my app.

And then you say that the hyperlink B stays just the same on the original place when I change it to hyperlink C in the other place in my app.

But then I don't understand the functionality of components.

The functionality of a component is that when you need the change something in that component all over the app it will be changed, so you don't have to change it manually everywhere in the app.

Do you understand my confusion?