My 2015 MacBook has no USB ports. How do I setup iTunes wifi syncing?1

It has a USB-C port which has adapters that include power and USB-3 connectors.

Actually, that one port on the left is a usb.

There are three kinds of usb: usb a, usb b, and usb c.

Usb a:

http://img.misco.eu/Resources/images/Modules/InformationBlocks/1210/CTG/CTG-1/15 4636-CablesToGo-1m-USB-4-Pin-Cable-small.jpg

Usb b:

http://www.c2g.com/uk/static/content/images/resources/connector-guides/450/035_u sb_b_f_iso.jpg

Usb c:

http://www7.pcmag.com/media/images/459862-what-is-usb-c.jpg?thumb=y&width=740&he ight=426

And then we have even more after that which are like subkinds: micro b, mini b, etc.

You can simply upload your music from your iPhone 6s to Apple with iCloud or store your music on the "cloud" aka apple's servers and sync to any other device with that same account. If you are truly stuck on the usb then you can also buy yourself a usb a to usb c adapter. Many hubs online also have charging capabilities and a usable usb c still left over with many usb a. Kickshark (http://www.kickshark.com/), a company I started working with, has done that very thing and are producing 2 options for this and many designs still to be released.

If you have any recommendations for products I can actually contact them for you and request it. Otherwise, there are still plenty of easy fix solutions.

Most usb type c's are usb 3 if not all.

Usb 1.0, 2.0, 3.0, and 3.1 are just speed standards and don't actually mean anything for the physical port itself. https://plus.google.com/+BensonLeung/posts/4xq4EDjXMw8

I do recommend getting a hub of some sort that provides its own power to devices. Many devices will not get sufficient power from the computer itself.

I've actually seen that. Ones with a battery inside too.