londonblue In my case, I recently rebuilt my site using the WordPress site editor and the Twenty Twenty-Two theme. I built it as closely as I could to the layout and design that I'd had before with the Avada theme.
When I built the single post template, I inserted a certain affiliate ad that I wanted on each page into the sidebar. I also inserted an Amazon Associates ad in the same template below the post block. That way, those two ads show on every post and if I want to change either or both of them, I can just change them one time in the single post template and have them carry on to the posts.