[Answered ]-Couldn't pass parameter "smm" to the specified path

The url template tag should be:

<li><a href="{%url 'corebloc_app:service_type' smm %}">Marketing & Management Services</a></li>

so you include the smm in the {% url … %} template tag ^[Django-doc]. If you want to use smm as string, you use:

<li><a href="{%url 'corebloc_app:service_type' 'smm' %}">Marketing & Management Services</a></li>