i would like to know if i do link exchanges to a sub-page , will the backlinks count for my main page also ? Assuming the sub-page has a link to the homepage. For eg if my site is http://www.thesite.com and i do link exchanges using the page http://www.thesite.com/12/ thx
No. Look at the backlinks for http://www.after5webdesign.com and http://www.after5webdesign.com/software.html. One has 196 while the other has 768. Both pages are very integrated into the rest of the site however, so PR gets spread pretty evenly throughout the site, but the backlinks to any spicific page are only for that page. By linking your sub page to your main page, you can ensure that PR is passed to your whole site, but the back links will only count for that page.