If you are talking about the Google Penguin Update, then keep away from the keyword staffing, Clocking & link schemes.
resent update is the google penguin update which is all about web spamming, keyword stuffing. The sites having this type of spamming get punished and as a result the ranking of keywords get down.
Ultimately, the best way to protect yourself from the recent Google update is to focus on providing good content to your visitors. Your content has to be readable and actually make sense for it to be deemed valuable by search engines nowadays. Your content should flow naturally and you should avoid any great hat tactics such as using variations of the same word, misspellings or alternating between singular and plural forms of the same word per instance.
It boils down to quality, quality quality.... quality content, quality on page SEO and quality off page SEO. Make sure all back links are from Relevant sites, Make sure all back links are form quality sites with good PR and that do not have a massive amount of external links and spammy comments on them. Links should be contextual and also majority of them should be Do follow The most important thing to keep in mind that you need to have a massive link diversity, links from various web 2.0 platforms, various social media platforms, edu, wiki's and also from sites/blogs that run under different CMS's ..... Even include twitter links and a very very effective tool to use as well is Pinterest.
There is no fixed solution available right now, but the most common thing you may noticed is google is penalizing only those website which are not updating the content on daily basis or site is not getting any backlinks from quality website.
The perfect solution is to avoid using duplicate content on your website and do proper white hat seo not black hat.
Hi guys you should go for quality link not for quantity. Search engine loves quality link better then quantity of back links. You should use unique content for your website. I hope it will help you to get out of panda update.
Google update their raking system by changing google penguin update. They don't accept black hat seo technique and for that reason they changed that.