so far i have only had a style.css file in the child theme folder. And I understand the way it works, i add CSS markup and then it loads the parent style.css markup after.
For a .php file (such as sidebar.php, which is what im trying to add code to) I read that i just copy the original file to the child theme folder and make any edits; this file now completely replaces the original.
Is this correct? If one of the biggest reasons to use a child theme is to avoid update issues, then this seems counter intuitive because there could be updates in sidebar.php that my child theme will totally miss and possibly have conflicts right?
or am i wrong?