Duuuuuude! I’m all about child themes now.
I had some difficulty creating child themes. I followed https://cyberchimps.com/guide/child-theme-example/ to create child themes for my WP install. the tutorial is missing one thing–
@import url("../twentyfifteen/style.css");
Adding this to the style.css links the parent css to the child theme. You’d have to replace “twentyfifteen” with the folder of the parent.