You can put upto 200-300, that is not the issue. But can you result out the content for your 20-30 keywords? Keywords relevant to content is the issue. That is the best practice.
Yes, the meta description, page title and H2 tags within content is more important and is helpful than keyword tags.Also, try to learn Drupal CMS and use the SEO module which provides an entry field for title tag and meta description. Meta description should begin with the word "desription" followed immediately by "|" and then the first sentence of the page content.
well thanks alot for info......and wat about how to use them in story like i write a story so it is very hard to include keywords like inspirational story or etc.. so how to do that ? any tips man?