It may be a very rudimentary problem, but trying to display a RichTextField
html
{{ page.body }}
In this way, if you write it in an HTML file in the same way as CharField etc.,
<p>body content</p>
In this way, the <p> </ p>
tag will also be displayed.
html
{% load wagtailcore_tags %}
...
{{ page.body|richtext }}
By writing using the richtext filter like this,
body content
I was able to display without the <p> </ p>
tag.