Q: I'm trying to sync or back up data from my iphone to a computer

I believe this support document is going to be your best start. This explains backups and how to get started. There are additional links under each section for you to turn to if you are experiencing troubles. Since the best you say is that you are challenged, no one would know where your problems lie and where to start, so see if you can navigate through the support document for assistance. If you have trouble after reading through that information, stop back.  About backups in iCloud and iTunes - Apple Support

You should have been backing up to your computer or cloud service regularly from day one.

Nothing should be stored only on your iPhone.

If for some reason you have failed to do this:

How to back up your devices using iCloud or iTunes - Apple ...

About backups in iCloud and iTunes - Apple Support

You should import your photos to your computer as you would with any digital camera.