my site is loaded with articles, i just installed a meta tag module that allows to tag each article with meta tags, is this very useful for SEO, also, how many keywords can you input into each article, would spamming be abuse, also keywords need to relate to the article correct? just asking cause it is time consuming to add keywords into each article..
meta tags can't hurt, but not as important for SEO than it use to be. how many keywords? that is measured by keyword density. A good range is 3-5% of the page with the keyword that you want searches for, anything more and its called "keyword spamming" Yes, keywords need to relate to the article...has to be relevent.