How to set up navigation on the site?

Question

Django

I'm making a multi-page Django site and I have a question about navigation.
I have links to subpages on the main page:

Sub_page_1, Sub_page_2, Sub_page_3

I went to the first subpage and in the address bar I have:

main_page/sub_page_1

And on this subpage is the navigation menu, which contains the same links as in the main menu.
Question: How can I make it so that I can go to another subpage? That is, in the address bar I had this:

main_page/sub_page_2