How to: Two-way Transfer Non-purchased & Purchased Media between iPhone and Windows 10

"In & Out" - Move any of your own movies, music, books into iPhone and iTunes purchases out of iPhone on Windows 10 for secured backup and playback freedom.
In the age of show business, the path of "amusing ourselves to death" surely should not be restricted by Apple iTunes. As it not merely brings content source limitations, but limits our joy to Apple-only devices.