While you can create headings right in the text editor, here are some advantages to using a Heading module:
You can more easily move the heading around in the layout by dissociating it from the following text.
You can easily customize typography, layout, and effects of individual headings (font family, weight, color, size, spacing, horizontal alignment, text shadow, animations, and margins).
Lets do Head
How will Blocks CSS Editor Plus aid in Styling in Gutenberg