Hey. Welcome.
You’ll have to have two files with different names. Then, you can call from Page 1 [[Page 2]].
After, open Page 2 and click the chain icon in the right-hand menu bar. There, you’ll see the pages mentioning your current page. (Backlinks)
If you want to link them two way: Mention [[Page 2]] on Page 1, and on Page 2 write [[Page 1]].