In our DEMO version we used additional extensions, here is a full list of them:

• SP Simple Portfolio (component + module)
• SP Page Builder (Pro) - Pro version is built-in only in QuickStart.
• Custom HTML (module)
• Breadcrumbs (module)
• Search (module)
• Menu (module)

The addcional extensions included in QuickStart are not required for the template to fully work. But they can be used to get the full functionality of your website, in the most advanced and recommended way and always upon choice. Most of them you can replace with others taken from JED. All extensions are 100% independent from each other. Using a Helix3 layout structure, the modules can be set one on the other like Lego bricks, making up a detached web site within hour. More JoomShaper extensions can be found on the  joomshaper.com/joomla-extensions page. We didn't use & override K2 (getk2.org) this time, but of course if you want you may install this extension.