
To answer your questions:
- Migration for sites, (large) lists and libraries along with folders and documents are supported by SharePoint Migration Tool (SPMT).
- Migration from My Sites to OneDrive for Business is supported using SPMT.
Detailed guidance can be found via this document: MySites to OneDrive Migration Guide. - Migration of Blog Sites is supported. You can create a classic site/subsite using the Blog site template in SharePoint Online and then do the migration.
- Migration for SharePoint 2010 Workflows are not supported. Please note that SharePoint 2010 workflows are deprecated from Microsoft 365 service, they can no longer be used in SharePoint Online.
You can see the reference here for what is supported by SPMT: SPMT supported features.
In addition, you can download and run SharePoint Migration Assessment Tool (SMAT) before using SPMT, to help you fix any issues that were discovered before the migration.
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