Opposite Of display:none?

Question

Is there an opposite to display:none? I want to make a website with a nav-bar and different sections rather than an article. At the click of the nav-buttons I want it to take away the previous slide and show the new one. Is there a way to do this? A visible example would be in this code

https://code.sololearn.com/Wz5KnbtSoLmY/?ref=app

I have been inspired by it.

Answer 1

display: initial;