I'm just getting started but want to play around in the right area practicing for a new personal site/theme.
Part A: I want to add featured images (and a few new image sizes) to a blog portion of a theme. It feels like all this should be done in the child theme itself, right?
Part B: I also want to add a portfolio page template with associated custom post type. (in a custom, plugin, correct?) Would it be ok to still include the page template in the theme?
Just looking for the best locations to add this, not the code itself.