how do you see what’s others on storage ?

Content categories (How to check the storage on your iPhone, iPad, )

iOS divides the used content in these categories:

• Apps: Installed apps and their content
• Photos: Photos and videos stored in the Photos app
• Media: Music, videos, podcasts, ringtones, and artwork
• Mail: Emails and their attachments
• Apple Books: Books and PDFs in the Books app
• Messages: Messages and their attachments
• iCloud Drive: iCloud Drive content that has been downloaded locally to your device.
• Other: Everything else, like system files, software updates, Siri voices, cached files, logs, and more.

iOS only displays the top categories. If a category doesn't take much space, it might be counted as "Other." Storage space taken by "System" is a combination of space taken by iOS and its supporting files. The amount of space required by "System" varies from device to device depending on the device type, model, country, carrier, Siri voices, and more.

See especially "About cached files ..." here.

How to check the storage on your iPhone, iPad, and iPod touch - Apple Support

others is just everything else that isn't using a significant enough amount of storage to be shown. if you scroll down to the list of apps you can see exactly how much each app is using.