Hi,

You can extend the website homepage like this,

<template id="new_homepage" inherit_id="website.homepage">
</template>

In Python,

from odoo import http
from odoo.addons.website.controllers.main import Website

class Website(Website):

    @http.route(auth='public')
    def index(self, data={}, **kw):
        super(Website, self).index(**kw)
        return http.request.render('<template_external_id>', data)

Please see this link: https://www.odoo.com/forum/help-1/question/odoo-v11-website-how-to-replace-home-page-139437

Thanks