How difficult is it to migrate Magento data?

How difficult is it to migrate existing data, including products, orders, and customers, from Magento to another platform, and what problems or errors are most common during migration?

Transferring data from Magento always seems difficult, but best magento shows how other users do it. I realized that it is important to think about the catalog structure, orders, and customer data in advance, test the migration, and prepare backups. This helped to avoid loss of information and errors, as well as accelerated the migration process and minimized the downtime of the store.