Oftentimes you are migrating to FusionAuth from another solution, whether it be homegrown or another vendor.
These guides and resources will help you understand and scope the migration process.
Other Useful Migration Resources
Plugins - custom password hashing support, so that you can migrate without requiring your users to change their password
APIs - Migrate data and configuration using the APIs
Client libraries - use the language of your choice to make FusionAuth API calls
Connectors - implement a gradual migration using this feature
Import scripts - open source scripts to import from CSV, Auth0 and more
FusionAuth Editions - some editions include FusionAuth team support for data migration
If you need further assistance migrating to FusionAuth, please ask a question in the FusionAuth forum.
If you have a licensed edition you may open a support request from your account.