How to connect my updated iphone to my mac?

I have no idea about Apple, I know my macbook has an old software and I don't know if it's the software. It said I need to download the newest iTunes but my software isn't compatible with the newest version! My iphone won't even show up!

The software SHOULD be compatible with your Mac, since it is an Apple Product.

Try updating again. If it doesn't work, and continues to say "Incompatible", then I would just go to the local Apple Store. They are good with things like this

Just update your iphone to the latest ios version and then install the latest itune software on your mac now with the help of your USB cable simpley connect the iphone to the mac.