Multiple Apple IDs
Can I have more than one Apple ID, in order to keep my business and personal uses separate on my devices.
iPhone SE, iOS 13
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You can have as many AppleIDs as you wish, although each requires a separate and verifiable email address. However, you can only use one at any given time with any given Apple device. And when it comes to the App, Music or Book stores, you can only change AppleIDs once every 90 days.
And if you change the AppleID used with iCloud without erasing each device each time you change it, you will end up merging data across those iCloud accounts.
So realistically, keeping multiple separate devices separate is very doable, but keeping the same device (iPhone or iPad) separate is not.
MacOS allows multiple user accounts, each of which can be associated with a distinct AppleID. But iOS (iPhones and iPod touch) and iPadOS (iPads) do not support multiple users.