I migrated all my products and categories from magento 1 to 2. I need logic to migrate orders which are placed by the customers . Can someone help me please.
You need to upgrade Your Magento version first, you can follow this document: https://devdocs.magento.com/guides/v2.3/cloud/project/project-upgrade.html
After completely upgraded, you need to find experienced migration experts to help you migrate data such as products, categories and orders from your old store on Magento 1 to Magento 2 smoothly, quickly and safely. This solution save you a lot of time and effort.