if i have a few of kws need to rank. will it be degrade to got a few of links from a domain for these kws as anchor text? for example: on a site: kw1 link , kw2 link , kw3 link(these links link to my site). is it the same as the 3 links from 3 different site?
Three links coming from different sites that are relevant and in good standing, will provide more value to your site. The example above looks a bit spammy!
for one kw, that is undoubtedly right. but for 3 kws? for example. you type a kw in google. google found backlink of your site for that kw are from different ip. you type another kw, still, google found backlink of your site for that kw are from different ip. but some of all of your backlink are from the same ip.