Google algorithm

Google gives a lot of "weight" to the title tag. So, try to put your target keywords in title tag for better SERPs. But you have to limite your title tags to 60 characters. Google does not use meta tags such as the keywords meta tag or the description meta tag because it has tendency to create description from first few lines of text on your site. Use your keywords smartly in content of your site. Avoide over optimization by repeating your target keywords.