Have I understood this correctly: It´s important for articles to have only one keyword and have it in title, the right density, etc. But it doesen´t matter so much on your landing page if you at least have the kw somewhere in there? I´ll give you an example: keywords are "acai berry", "buy acai berry" and "acai berry rules". I have articles and we 2.0 properties for each of them, highly optimized, but on my landing page they are just mentioned somewhere and it´s enough? Also, do I need to have domain for each keyword or is it enough to have domain like "acaiberry.com" for my landing page?