I am interested in learning to troubleshoot and fix IOS issues wanted to know which books or websites to refer or from where I can get reading material.
Thanks
This is a good start (clicking on "Table of content"):--> iPhone User Guide - Apple Support
Regards
Giulio
Beyond the iOS user manual I already posted, before googling the issue (risking also misleading paths), I would have suggested the OP to investigate among Apple Support articles here:--> https://support.apple.com/kb/index?page=search&locale=en_US
Regards
Giulio
Google the issue. You'll often find useful links
How to learn to trouble shoot ios
