I’m reading a book ‘Python Crash Course 2nd edition’ and currently doing a Django project.

And in a form there are button with name=”submit” and and hidden input element with name=”next”.

In the book it says that the button with name=”submit” is a submit button and a hidden form element with name “next” is the value argument that tells Django where to redirect the user after they’ve logged in successfully.

I tried to search up button with name=”submit” and input hidden element with name=”next” in Django but wasn’t able to find any info.

How does it work? Are those somewhere predefined or no?

<form method="post" action="{% url 'users:login' %}">
     {% csrf_token %}
     {{ form.as_p }}
    
     <button name="submit">Log in</button>
     <input type="hidden" name="next" value="{% url 'learning_logs:index' %}" />

</form>