Hub Sites–Office 365

What is a Hub Site

https://support.office.com/en-us/article/what-is-a-sharepoint-hub-site-fe26ae84-14b7-45b6-a6d1-948b3966427f?ui=en-US&rs=en-US&ad=US

Hub Site Overview

https://docs.microsoft.com/en-us/sharepoint/dev/features/hub-site/hub-site-overview

Planning your SharePoint hub sites

https://docs.microsoft.com/en-us/sharepoint/planning-hub-sites

How to Create Hub Sites in SharePoint Online

https://sharepointmaven.com/how-to-create-hub-sites-in-sharepoint-online/

Old Info

What is a SharePoint hub site?
https://support.office.com/en-us/article/what-is-a-sharepoint-hub-site-fe26ae84-14b7-45b6-a6d1-948b3966427f

Create Hub Site – PowerShell
https://docs.microsoft.com/en-us/sharepoint/dev/features/hub-site/create-hub-site-with-powershell

Hub Site Guide 2019.4
https://o365.co.uk/the-ultimate-guide-to-sharepoint-hub-sites/