iphone – What i need to do to backup and secure my mobile data before sending it to repair

I have iPhone 11 and its screen was broken, so I will send it to an authorized reseller for Apple. but before doing so I will remove all the data I have these data include; photos, videos, apps (mail app, WhatsApp, and other apps).

so I have these 2 questions:-

  1. Is there a way to backup all my data and apps and to be able to restore them after getting my mobile fixed?

  2. How I can securely remove the data inside my phone, so it can not be recovered when I send it to the technician?