Default FAQ URL is yoursite.com/faq. You can change it under Settings / Permalinks. You can manage your FAQ posts under FAQ. Global FAQ settings can be changed under Appearance / Customize / FAQ. This post type comes with several custom widgets which you can find under Appearance / Widgets.
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Default knowledge base URL is yoursite.com/knowledge-base. You can change it under Settings / Permalinks. You can manage your knowledge base articles under Knowledge Base. Global knowledge base settings can be changed under Appearance / Customize / Knowledge Base. This post type comes with several custom widgets which you can find under Appearance / Widgets.
Posts and pages are part of the core WordPress functionality. The best place to learn more about them is the WordPress Codex. Learn more about posts Learn more about pages