Do I need to assign system page templates when I use HubSpot's free CMS tools?

Usually, no. HubSpot's free tools may not provide the settings needed to assign templates for system pages such as error, search, subscription, or membership pages. Your theme can still include those templates, so you can return to this step if your HubSpot subscription later gives you access to the relevant system-page settings. Because HubSpot packaging can change, check your current account options before assuming a specific system page is available.