How do I retrieve all my photos off of my other iPhone
How do I get all my photos transferred
iPhone 6s, iOS 13
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The easiest way if with iCloud Photos:
Set up and use iCloud Photos - https://support.apple.com/HT204264 - FAQ
Use iCloud Photos to store photos in iCloud
https://support.apple.com/guide/photos/from-icloud-photos-phtf5e48489c/mac
Use iCloud to transfer data from your previous iOS device to your new iPhone, iPad, or iPod touch --> https://support.apple.com/HT210217