How can the family share photo?

When in Family sharing, a shared album is automatically created in the Photos App of each iOS device, Mac or iCloud Photos on Windows PCs (with iCloud for Windows).

See here: Share iPad photos with Shared Albums in iCloud - Apple Support

and here: Turn on Shared Albums in Photos on Mac - Apple Support

and here: Share albums using iCloud for Windows - Apple Support

For Sharing Music see here: Use Family Sharing to share iTunes Store purchases in Music on Mac - Apple Support

and here: See what friends are listening to in Apple Music on your iPhone, iPad, iPod touch, or Android device - Apple Support