you don’t need advert or top or bottom.
You should only use these four values - advert, header, content, footer
You should not have advert at the top, so you have replaced it with top, but top is wrong based on the above hint, replace top with one of those four values relevant to th Qn, and similarly replace bottom with one of those values
Yes, you have two columns, so the top should be “header header” and the footer should change similarly.