How to get rid of unnecessary photos on my iphone?

I ran out of space on my iphone, so I decided to back the photos up on a flash drive with a computer. When I opened the files, there were 4 folders with really wacky names and they contained photos that I've previously deleted, and the same photo is stored in multiple locations! I find it obvious that this is taking up space on my phone and that annoys me. Does anyone know how to delete them? I can't find them on my phone and I can't delete them with windows file explorer

You can find all of your photo syncing options in iTunes. Similar to how you'd go about selecting which songs to sync.

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