You can add headings to your homebrew document using the # symbol in the Brew Editor:
# Here is my heading
Et labore pariatur sunt ad ad pariatur magna. Duis sit velit commodo. Laborum esse aliqua dolor. Dolor nulla Lorem proident fugiat est qui do officia officia ullamco irure anim ad. Consequat nisi officia pariatur occaecat laboris do.When you are writing at length, you’ll likely want to have different levels of headings to give your brew some hierarchical structure– first you’ll have a top-level header (or “Header 1”), and then nested under that several more headers (“Header 2”, “Header 3”, etc).
Increase the number of # symbols to increase the depth of the header, up to six:
# Dark Mage
Officia adipisicing fugiat sint qui pariatur sint pariatur cillum tempor est nisi dolore quis enim. Et culpa excepteur occaecat anim est. ... Sunt laboris tempor in ipsum sit et nisi.
## Background
Veniam anim deserunt laborum in incididunt ad fugiat qui excepteur cillum nisi velit. Fugiat laborum qui exercitation velit quis aute excepteur.
## Appearance
Voluptate elit laborum et sit veniam duis voluptate quis ipsum et eu ad qui dolore. Sunt enim mollit ex est cupidatat minim sit cupidatat est.
### Alternate
Veniam anim deserunt laborum in incididunt ad fugiat qui excepteur cillum nisi velit. Fugiat laborum qui exercitation velit quis aute excepteur.
## Abilities
Sunt commodo fugiat esse et nostrud cillum in duis est sit esse irure proident. ... Mollit ut incididunt deserunt.
### Teleport
Elit nostrud eiusmod qui consectetur voluptate quis minim eu proident irure reprehenderit amet ea elit labore.

You can see that the styling of each header level is different, generally decreasing in size and visual impact as you get to higher levels. This is just a stylistic difference, and can be changed with CSS in the Style Editor. Generally, you want to avoid using a particular level of header based solely on it’s appearance/size, particularly if you are sharing a brew via a Homebrewery link or PDF. Using inappropriate headers impacts accessibility for screen readers, and can impact other things, such as how PDF readers generate their document outlines.