iPhone and laptop
How do I disconnect my photos on my phone and my Mac. Every time I delete something from my phone in my photos it deletes from my photos on my Mac.
iPhone 6s Plus
If you’re using iCloud photos, that is how it works. It is a synchronization service. Set up and use iCloud Photos - Apple Support
If all your pictures are already on your Mac, then turn off iCloud photo on the Mac and chose to keep the originals there. You can manually transfer new photos from the iPhone just as you would with any other camera - Transfer photos and videos from your iPhone, iPad, or iPod touch - Apple Support