I am new to internet marketing, but I have some basic knowledge of PPC. I didn't see a "newbie" question section, so I figured I would post my questions here. My question is in regards to SEO keywords for my website. If a keyword has a high search rate, does this mean that it will automatically be difficult to rank my site for that keyword in the SERP? Can I really only use keywords for my SEO efforts that are highly relevant to my site? Thanks.