1) Does using tags such as bold, italic and blockquote affect SEO? IF so what are other tags that can be used. Also, what is the difference between bold and strong in terms of seo? 2) Does using different tenses and endings of keywords affect the keyword density? Will search engines see kick, kicks, kicking and kicked as the same word or will they all have their own density score? 3) Which keyword density tool do you use as I have tried a few and the density scores differ between the tools by almost 4%.