WHich one BettEr ??

Hey I wanna Know that

1. Which one is better onsite seo or off site seo

2. Can i rank my site using for multiple keywords?

3. NoHands SEO is good tool for SEO??4. Blogspot is better or .com?? (I'm asking this because since last days i sam many blogspot ranked on good position rather than .com, so whats the reason??)

Thanks

I think onsite seo is better than offsite seo. And it is also very reliable too.