Make user be able to edit text

Hey guys,
I’m still a newbie and I don’t know how to find this exactly in the forum so I’ll try to explain my goal.

I want to create a modal where user can press a button and edit the titles <h1,h2…> and other text that is already being displayed from data of DB on the content page.
The only idea that comes to my mind is by using forms but I was wondering if there was another way to do it.

Thanks in advance!