When updating existing themes, if that theme is then updated all your hard coded changes will be lost! The child theme lets you update the parent theme and keep all those changes, so any security or functionality changes will be included in your main site!
When developing, having a child theme can really help you speed up the development process.
If you are a beginner to developing Wordpress themes having a child theme lets you tinker away without causing a major problem to your site. If you make a mistake you can just undo the changes in the child theme and the parent theme will take over the original operation.
I will log in to your website, create a child theme for you ready to edit and have fun with and upload that theme to your site!
If you have any questions please don't hesitate to ask me.
*** PLEASE CONTACT ME BEFORE PLACING ANY ORDERS. ***