If you make a link like [[new page]] it will appear as “new page” on the site.
Here’s the (apparently) secret naming option:
Of you make a link like [[new page|Create a new page]] it will appear as “Create a new page”, yet it will link just as if you only wrote [[new page]] – hence whatever is before the pipe | symbol is the link, and anything after is the link “name”.

Notice though, the title of the new page in this case will be “new page” – NOT “Create a new page” as you might (rightfully) have expected.