Source: For more information and whole article go to : https://techcommunity.microsoft.com/t5/SharePoint-Blog/Introducing-the-SharePoint-Migration-Tool-from-Microsoft/ba-p/109767
For additional details and to see the SharePoint Migration Tool in action, check out the video below.
While the SharePoint Migration Tool provides support for many migration scenarios, we recognize your needs may differ in scope and complexity. For more complex migrations, support with adoption and usage, or help planning Microsoft FastTrack includes resources, tools, and experts to make your rollout of Office 365 a success.
Getting Started
To get started and preview the new SharePoint Migration Tool from Microsoft visit https://aka.ms/spmt.
Resources
How to use the SharePoint Migration Tool
How the SharePoint Migration Tool works
How to format your CSV file for data content migration
Create a user mapping file for data content migration
SharePoint Online and OneDrive Migration Speed SharePoint Online provided Azure containers and queues for SPO Migration API