If I restore my iPhone 6+ would it erase everything?

If I restore my iPhone 6+ would it erase everything? - 1

Yes of course. ITunes will very clearly tell you that everything will be erased off of your iPhone. Make a backup before continuing.

Yes. That's the point.

Yes. It restores to factory settings. It didn't come from the factory with any of your personal data did it?

Back up to iTunes b4 resetting or transfer photos to fb and you can make the folder private if you don't want anyone to see them.