Help Please: Installing Web Fonts And File To Edit For H1

I want to add webfonts, I gather from one post these would be added the schema.json file under Font Families - Is this correct.

If the above is correct in which file would I alter the H1 style to change the style to the new webfont?

Thanks in advance.

Cheers

You can add new font via the CSS section of the Theme editor

https://css-tricks.com/snippets/css/using-font-face/

Then add the following query there

h1 {
    font-family: 'MyWebFont' !important;
}