Which type of keywords we shoud use in our website. and what's the ratio of keywords should be in any particular webpage.
Uh, I'd love to give specific information and help but without knowing the details (eg site url, name, etc.) I can't help you. In general the keywords that you are targeting would be directly related to your website content and your website as a whole. For example, if you have a website that sold Autographed Baseball Cards, you'd want to incorporate whatever keywords you are going after into the website content. Don't worry about keyword density too much, don't be spammy, just repeat the keyword a few times (2.9% density is what I try and go after, but I'm not anal about it). Let us know a little bit more about your website (name/url/keywords) if you want any specific help.
Right now i don't want to share my website. i want to know the general things which thing is better for SEO perspective like link building, SMO or any other thing. by which we can get the ranks fast.