* avoid door mode pages
* avoid redirection
* avoid clocking
* avoid hidden links at pages
* avoid hidden text in the pages
* avoid keywords stuffing on the pages
* avoid page stuffed by worthlessness keywords
* avoid duplicate content in Web site.
* avoid unrelated links at your link pages.
* avoid intentional misspelling in your page content.
If you are follows these steps than you will definitely achieve good position in all search engine.