{% extends '::layout.html.twig' %}

{% block body %}

<h1>My home page</h1>

{{ videoNumber }}

{% endblock body %}

{% extends '::layout.html.twig' %}

{% block body %}

    <h1>My home page</h1>

    {{ videoNumber }}
    {{ form(form) }}

{% endblock body %}

Add form and Indetation (sic !)
Add form and Indetation (sic !)