Can linking to your website from Forums that have a high Page Rank get you a better spot on google?

to get a site on top in search engines the better way to do link building (directory submission, link exchange and blogs etc)in the right category for your site.and it dosnt matter that those site's internal pages are not ranked but homepage pr should be good.most important thing to do all this target right keyword.before doing all this make sure that your site has correct meta tags, meta keywords and meta titles.