How can I create editable sections on Wordpress?

I am building my first wordpress theme and I can't seem to figure out how to make another editable section. For instance, I have a hero with the h1 of "Lorem Ipsum, Foo Bar." But would like to be able to edit this later on down the line from the admin panel.

Is this possible? I have the ACF(Advanced Custom Fields) plug in, but it doesn't seem to be the solution I'm looking for. I don't want a field as in a form on my "site preview page".

Does this make sense?

Here is how I wrote my <h1>

<h1><?php the_field('homepage_hero_text'); ?></h1>

Here is the field I made in ACF:

But the field does not appear in my homepage admin panel:

via Chebli Mohamed