# make sure to define the correct path to your html page when rendering a view

# prev:

def found_or_join_startup(request):
    return render(request, 'templates/categories/found-or-join-startup.html')
   # templates/ interferes with the filepath that is defined in urls.py

# after fix

def found_or_join_startup(request):
    return render(request, 'categories/found-or-join-startup.html')