Change Store preferences in iTunes on Mac
To change these preferences, choose iTunes > Preferences, then click Store.
Choose whether to require a password for additional purchases after making a purchase from the iTunes Store with this computer, and whether to require a password for free downloads.
Sync playback information across devices
If you pause a film, TV programme, podcast, iTunes lesson or audiobook, your playback position is automatically updated on every computer and iOS device that’s signed in to the iTunes Store using your Apple ID.
Sync podcast subscriptions and settings
Automatically sync any changes you make to your podcast subscriptions and settings to every computer and iOS device that’s signed in to the iTunes Store using your Apple ID.
Automatically download album artwork
Automatically add album artwork for music you import into iTunes from CDs or other sources. Artwork is already included with all music purchased from the iTunes Store.
Share details about your library with Apple
Allow iTunes to automatically download photos, PDF files and other extras related to items in your library.