How to edit default Header tags

What are H1,H2 etc tags and can I edit the styles?

@Boskednan
If you use the Header Stack, when you go to the page inspector about the stack it will tell you what each header number means; i.e; H1, H2, H3 etc.

The only header style I have changed is to center the header rather than have it left justified. To do that go into the CSS tab for the page inspector for the Header stack. It’s the 3rd icon from the left. I use this snippet to center the H3 header

h3 { text-align:center; }

Mary

Thank you Mary, that is very helpful.
Douglas