Child theme example

Does someone want to share the code they have used to successfully make a child theme? I’ve read several threads on this but none of the solutions offered have worked for me.

It would be very helpful if I could just look at the actual code that someone has used successfully in their child them since .css files are squirrely on this one. Thanks!

I’m using expound 1.9 and all I want to do is change the ration of the primary and secondary content areas. The primary is too wide and the secondary not wide enough.

Much appreciated!