In JoomShaper Quickstart we used additional, not Joomla core, JoomShaper extensions:

• SP Page Builder 3.x Pro - Pro version is built-in in QuickStart only
• SP Simple Portfolio
• SP Simple Portfolio Module
• SP Easy Image Gallery

Joomla Core extensions:

• Articles - Latest (Joomla core module)
• Breadcrumbs (Joomla core module)
• Login (Joomla core module)
• Search (Joomla core module)
• Menu (Joomla core module)

Where do you get extensions from?

Apart from the few dozen extensions that are part of the quickstart installation (developed by Joomla and JoomShaper team), you can find thousands of additional extensions developed by third parties on the web. Most of these are listed on extensions.joomla.org, the Joomla Extensions Directory (or JED, as it is fondly called by the Joomla community). Anytime you can install new modules, plugins or components.

But remember the main rule: less is more, also in the security area. Don't install components nor modules from suspicious websites/forums, in most cases they include malware code inside.