How to get rid of “Other” in iPhone storage? This is very frustrating how do I get rid of this?? I can’t download apps anymore because my storage is full of something I don’t know about.

Other: Non-removable mobile assets, like Siri voices, fonts, dictionaries, non-removable logs and caches, Spotlight index, and system data, such as Keychain and CloudKit Database. Cached files can't be deleted by the system.

Here's a list of the types of content on your device, and what each type includes:

• Audio: Songs, audio podcasts, audiobooks, voice memos, and ringtones.
• Video: Movies, music videos, and TV shows.
• Photos: Content in your Photo Library, Camera Roll, and Photo Stream.
• Apps: Installed apps. The content of the apps is listed under Documents & Data.
• Books: iBooks books, audio books, and PDF files.
• Documents & Data: Safari Offline Reading List, files stored within installed apps, and app content like contacts, calendars, messages, and emails (and their attachments).
• Other: Settings, Siri voices, system data, and cached files.

About cached files in "Other"

Finder and iTunes categorize cached music, videos, and photos as Other instead of actual songs, videos, or photos. Cached files are created when you stream or view content like music, videos, and photos. When you stream music or video, that content is stored as cached files on your device so you can quickly access it again.

Your device automatically removes cached files and temporary files when your device needs more space.

If storage on your device differs from what you see in Finder or iTunes

Since Finder and iTunes categorize cached files as Other, reported usage for Music or Videos might differ. To view usage on your device, go to Settings > General > [Device] Storage.

If you want to delete the cached files from your device

Your device automatically deletes cached files and temporary files when it needs more space. You don't need to delete them yourself.