design-themes/theme_bookstore/views/snippets/s_banner.xml

<?xml version="1.0" encoding="utf-8"?>
<odoo>

<template id="s_banner" inherit_id="website.s_banner">
    <!-- Title -->
    <xpath expr="//h1" position="replace" mode="inner">
        The best sellers <br/>of the year
    </xpath>
    <!-- Button -->
    <xpath expr="//a[hasclass('btn')]" position="replace" mode="inner">
        Discover it <span class="fa fa-angle-right ms-2"/>
    </xpath>
</template>

</odoo>