Is it better to do no follow and exclude from Google sitemaps, the listing pages, which show the list of all the products in form of paging having sub contents as intro from the landing pages having original contents to avoid on site contents duplication.
The contents on my landing pages having the begining sentences on listing pages may cause duplication issue and I may lose the worth of my original landing pages contents.
Nofollow won't exclude a page - noindex will however, I assume that's what you mean.
First thing is, internal duplicate content does not usually mean a penalty. It does mean however that the "wrong page" might end up in the SERPs. My question is what good this listings page does your visitors. It doesn't sound all that attractive or useful to me.
My question is what good this listings page does your visitors.
Listings are the source of combination to compare items having intro paragraph and more link in each to be clicked and opened the detailed page. If internal contents duplication is not causing penalty to rank my website keyword then i would like to go with optimisation of this page as well having duplicated titles in H3 and duplicated intro paragraphs.
Google may pick up and rank keywords from listings more than detailed page which i observed in few competitors site.