it says
firmware > 6.55GB
cached data > 722MB
apps > 8.92GB (i cant seem to move any of these to my sd card?
images > 20MB
audio > 0 B
videos > 0 B
Other > 22.80MB
.....
OK so this does shed some light on the matter. The firmware, your phone's Android operating system, is for the most part a complete non-issue as far as your free storage space problem. It has to be there, without an operating system your phone can't do anything at all. Plus, unless you root your phone you don't have access to it anyway.
As far as the cached data amount, 700+MB is a bit high but that's more of a subjective observation than anything. I typically don't recommend this as a regular maintenance task but in this particular instance if might apply. Go into your Settings >> Storage >> Internal storage and tap on 'Cached data' to wipe those app caches. Note this will be something of a temporary solution as your apps need their app caches to function so by deleting them, each time you initially use an app it has to rebuild its cache. But there could be a problem where there's a corrupted cache buried in one of those app caches that gets wiped when you manually wipe the app caches so the total might not creep back up into that 700MB range. Also note that some apps might take some time to rebuild their cache. Just as an example, Google Photos stores the thumbnails it uses when you open the app in its cache so when its cache gets wiped the app has to rebuild it. (... and just to reaffirm, your photos are untouched, the cache only affects those thumbnail images.)
With almost 9GB of apps, that's a focal point to address. Either you like to have a lot of apps or you like to dabble in installing/removing a lot of apps. One tip is whenever you're uninstalling an app, tap on the 'Force Stop' button, then tap on 'Storage' and tap on the 'Clear Data' button, and then go back and tap that 'Uninstall' button. If you just use 'Uninstall' by itself that does not necessarily mean everything related to the app gets removed.
But getting back to that 9GB, if you do have a large number of apps installed and if you want to keep them all, read through what
@Hadron wrote out in detail. If you've been installing/removing a lot of apps you might be able to clean up some leftover data from previously uninstalled apps using a file manager app but that's going to be a bit of a project as it's easier to wipe old app data during the initial uninstall than doing so manually later. Whichever the situation though, 9GB is a lot of app data, if you go into your Play Store app, tap on the hamburger menu (three horizontal lines in the upper left), tap on 'My apps & games', and then tap on the 'Installed' column, how may apps do you have currently on your phone?