Do you have a Migration plan?

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
• 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