My personal experience ? Hate iTunes to the max. Swear not to use it. That was the reason moved to android 3 years. But it's ecosystem is so sucky until cannot stand it and move back to iOS.

Backup details all go icloud. Photo backup only connect to pc buy manual copy paste to hard disk. Or many ppl suggest here, just use goggle photo.

Music buy direct from iTunes in the phone. Or just use Spotify/Apple Music.

The era of syncing to iTunes via pc is dead. Thank god for that.

walao bro u bought benks jugak? thats what happened to me last time also, i bought full tempered glass benks brand for my iPhone 6S Plus, upon installation, no bubble, BUT doesn't adhere perfectly, can see all edges surround lift up. The glue only stick in the middle of the glass. Really bad thats why i hated the benks product.

Just go to machines and apply hoda lah bro. They can apply for u until u fully satisfied, thats the best thing about buying accessories at machines. i remember back then when iPhone 6 time i bought tempered glass for my mum there, got bubble, i said to them and they keep on opening a new box of screen protector and applied them until no bubble like nobody business. hahaha.

don't go naked bro, once u noticed all those micro scratches later make u sakit hati je.