Awesome @Teodor!
It may just be a niche term, but it usually means the top section of a home page that has a large image background and a large title and some sort of Call to Action.
Here is a hero without a title: https://www.music-man.com/
Here is one with:
Think of it as any text that you want to REALLY stand out. Not saying that is exclusively what the title is for. But, I believe that is the intent. The Display 1 - 4 classes that I and psweb mentioned make the h1 even bigger. So…it is all about that really important message when you think about it.
And when I think of the paragraph element in Wappler, you can change it to h1 - h6 as mentioned previously. This, to me, just implies that it is for everywhere else. Like standard headings or paragraphs.