What are the factor effect on keyword postion?

[magician]

The factor of error in Onpage process or Link building process effect on key word position.

[Michael-Goode]

Hi Hoang Huy Do,

The following page explains quite nicely where you should keywords in regards to on-page optimisation.

http://www.seomoz.org/learn-seo/on-page-factors

In regards to link building, never go overboard with keyword anchor texts. I believe something around 3-4% can be keywords you are aiming for. Otherwise, it should be your business name or natural text such "click here" etc.

[magician]

Thank you!