yes — but all changes should be made to the css file in root of the child theme, OR to /assets/css/custom.css? I think the video said “custom.css” but I want to make sure.
I’d also like to add a phone number to the top right. Should I copy header.php to the child theme and make my HTML edit there( (e.g. inserting the phone number with a div and/or a new .css class). And the of course style it in the child theme .css file as described above?