Hi there I am new to wordpress and was told to use Child theme to customize the default twenty ten theme so future updates wont set back the theme to default again.
But the thing is I am almost done customizing, just need to do a few more css changes, so the questions is:
1.)Is it too late to use child theme?
2.) I have no idea how to do changes in child theme, when I alter css or header.php I normally find out what the div is or find specific code and change it or add something to it, the child theme is empty! say I want to add a title image and make it center and bigger what do I put in the child theme's css and to add extra sidebar?