Can some mentioned of content.html be made on this page. I'd named one of my templates content.html and any use of show_content such as {% show_content page_object "title" %} recursively included the template!

When should one use a placeholder and when should one use show_content?

how do truncate the "body"?

to truncate the body you can use the builtin "truncatewords" (or the "truncatewords_html") filter. The following example will truncate the body after 100 words:

{% show_content current_page "body"|truncatewords:100 %}

{% show_content current_page "body"|truncatewords:100 %}- this method does not work.

My partner figured it out its

{% get_content dd "body" as content %}

{% autoescape off %} {{content|truncatewords_html:5}} {% endautoescape %}

Don't you think the tags page_menu, page_sub_menu... and so on, should also allow "slug" as page parameter ?

Right! Slug would be right parameter here