How come iphone doesn't have playlist like for music? It's messy?

And how do I know what is taking up my phone's space?
I got few gigs but I don't have much file.

Added (1). i was asking for movies though. Strange I thouight i did type like music for movies.

Videos don't have playlist.

Added (2). I don't see no usage on settings.

Added (3). using phone 6 ver

You can make playlists for your music on your iphone or on itunes. Also, go to your settings and click usage to see what is taking up space.

There are the options for playlists.
& you can check what is taking up the space in the Settings.

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