A rout-able page is basically a page that wagtail doesn’t have too much control over

INSTALLED_APPS = [
...
    "wagtail.contrib.routable_page"

inside home’s models.py:

from wagtail.contrib.routable_page.models import RoutablePageMixin, route
from django.shortcuts import render

class HomePage(RoutablePageMixin, Page):
    """
    Home Page Model
    """
    # Define templates that can be used with this model
    templates = "home/home_page.html"
...
...
@route(r'^$') # empty regex
    def the_subscribe_page(self, request, *args, **kwargs):
        context = self.get_context(request, *args, **kwargs)
        context["a_special_test"] = "Hello World!"
        return render(request, "home/subscribe.html", context)

Create a subsribers template, the routable page will now over ride it!

{% extends 'base.html' %}

{%block content%}

This is a test page {{ a_special_test }}

{% endblock %}

We can now change the regex to route the user to where we want them to go :)

@route(r'^subscribe/$')
    def the_subscribe_page(self, request, *args, **kwargs):
        context = self.get_context(request, *args, **kwargs)
        context["a_special_test"] = "Hello World!"
        return render(request, "home/subscribe.html", context)

We can go to the blog app and change the blog listing page to add a routable page that shows only the latest blog!

def get_context(self, request, *args, **kwargs):
        """Adding Custom stuff to our context."""
        context = super().get_context(request, *args, **kwargs)
        context["posts"] = BlogDetailPage.objects.live().public()
        return context

@route(r'^latest/$')
    def latest_blog_posts(self, request, *args, **kwargs):
        context = self.get_context(request, *args, **kwargs)
        context["latest_post"] = BlogDetailPage.objects.live().public()[:1]
        return render(request, 'blog/latest_posts.html', context)

With a routable URL, you can add additional context rather than putting it all in the original context!!