Magento has only 2 versions: free Community Edition and paid Enterprise Edition.
Start with Community Edition. If you would need for Enterprise Edition you will definitely know it.
Magento had a cloud version some years ago (it was named "Magento Go") but shut it down, I think, because Magento is for more complex tasks than Prestashop and a cloud software is not so customizable and extendable to solve complex tasks.
so if i want to start learning i go with community edition?
for business purposses aka online stores there's enterprise edition?