SharePoint Upgrade 2007, 2010, 2013, SharePoint Online

As a SharePoint consultant past 6 years I have performed various SharePoint Upgrades.

My experience shows that typically the migration road map looks like this:

Want to take a peek what were actual challenges and discoveries of SharePoint upgrade?

You are more than welcome to dive into it!

Upgrade from SP2007 to SP2010

Upgrade from SP2010 to SP2013

Manual migration from on-prem to SPOnline