The structure of the city portal?

Question

Search Engine Optimization

I am making a city portal. It has several sections - a telephone directory, news, announcements, etc. Where should they be placed - on a subdomain or in a directory? The main thing is that the search engines should be good

Answer 1

In a directory.

Answer 2

img {
  filter: grayscale(100%);
}
img:hover {
  filter: grayscale(0%);
}

If Internet Explorer is not required .