My IPhone storage going down even thou I haven't downloaded anything?

I've got a 16Gb iPhone and I'm new to apple, I checked the storage last night and it was 10.7 and today it's now 10.0 and I haven't downloaded a single thing! I haven't sent any texts and the safari data is like 20kg
I plugged it into iTunes and the "Other" section is like 2gb which confused me as I literally have a few songs and maybe 5 apps and that's it, I've restored my phone and nothing has changed gb still going down.

Cache data. The apps you use accumulate cache data over time & this results in what you are seeing. This is normal, also not limited to iOS.

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