How to store my pictures on iPhone?

I currently have an iPhone 6s Plus, I have like 5k pictures on it and I'm selling it via Craigslist tonight & picking up the 7 directly after. How can I save my pictures somewhere?

Upload them to Google Photo for free and then you can safely delete them from your phone

ICloud or any cloud storage service

You can back them up to your computer using iTunes.

NEVER use your phone as storage for important data.

ICloud Photo Library or Flickr or Google Photos or put them on a computer.

Create a fresh back up using iTunes, when you get the new iPhone do a restore from back up.

Don't forget to restore the one you're selling to 'as a new phone' before handing it over.

I use dropbox to transfer the photos from iphone to pc or vice versa. You can even use google photos

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