How many keywords should I've at my blog? At one seo help site it stood maximum 8 but at another I just saw maximum of 30! I optimized my blog for the 8 keywords before but I think my google results dropped after that even for the keywords that I still have in meta tag.
Google does not care about your keywords meta tag. Since that tag has been spammed for so long, Google no longer relies on it. It does still help rankings on MSN & Yahoo. Just don't obsess over picking keywords though. It won't matter much if you use 8 or 30. Some sites do recommend keeping it to under 10, but I have not actually tested that theory. It does make sense to not dilute your more important keywords too much. If you want good rankings, it mostly comes down to building quality backlinks using your target keywords as link anchor text.
Yes, that's what I though aswell because I get like 50-60 hits from google daily and only 5-6 come from keyword. Probably because my main topic is not that popular to get more than 100 hits/day with the first google result when you serach for my topic.
One main keyword for your entire blog... Some more keywords which are most related on your site's niche... Remember to optimize your blog, on-page...