At a high level, the plan is:
- Choose your SharePoint Online Plan (for most companies already included in o365 plan)
Compare SharePoint Online options
- Choose a migration tool to help you migrate the content online
i.e. at SSW we use Sharegate
- Install the migration tool
- Migration tool - Configure connections to your source and target SharePoint site collections
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Migration tool - Migrate your content
- Structure migration and content (dry-run)
- Analyse result reports
- Fix potential errors and warnings (repeat until you get to zero - see rule #2)
- Structure migration and content (for real)
- Remove permissions on your on-premises SharePoint site(s) and give access to SharePoint Online
- After a week, decommission your on-premises farm
