How to transfer everything from one iphone to another?

How can i transfer my contacts, whatsapp (paid app) to my other iphone?

Added (1). Especially my phone contactsss?

Sign in with your existing iCloud ID (Apple ID under Settings/iCloud) to your new phone
Done
(you'll have to redownload WhatsApp, but it will be free)

Using iTunes

backup the old iPhone
restore from backup to the new iPhone

Done.

(& no you would not have to redownload WhatsApp)

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