What is involved in Migration:
You might have noted that instead of upgrade we are saying it as migration as code set and data base will change so you will have to migrate data and use a new set of code.
1. Theme Migration : Check with your theme provider if they have come up with Magento2 compatible theme if you want to keep the same design
2. Extensions : Check with Module providers if they have a module for Magento 2
3. Customization : In case you have extended features and if you still feel they are needed and features not a part of Magento 2.2.x then you will need to go with customization
4. Data Migration : Customer and Product data we recommend should be migrated. Migrating orders will be a tough job and not recommended
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