How to use the if else clause in a Jekyll liquid page

if is a control flow tag, that can change the information Liquid shows using programming logic:

{% if page.title %}
  {% if page.jsonld %}
    {% include {{page.jsonld}}.html %}
  {% else %}
    {% include postJSONLD.html %}
  {% endif %}
{% else %}
  {% include homeJSONLD.html %}
{% endif %}

Reference - https://shopify.github.io/liquid/tags/control-flow/

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