Flash
If you’re planning to make a new website using Flash making a new website and thinking of using Flash – stop. Though Adobe has made some arrangement with Google and Yahoo search Engines and shared its technologies with them which helps a little to made Flash crawlable in these search engines in the recent times. But using Flash is still not a very good choice.
Most of the search engines give weightage to the website due to it content. If you don’t offer a significant amount of text content to the search engines, you will have to invest more in links to optimize your website. A flash site not only costs you more but also requires more money and time to optimize it.
No Use of Title Tags
Title tag is the most powerful HTML tag that plays an important role during the SEO process. It is wise to put your keyword in the title tag for better optimization results. This is the part that shows up in search results as a big blue link, so make it count. So don’t forget to use Title Tag. Another mistake that is often made by webmasters is that they put irrelevant word or phrases in the title tag which don’t help in optimization process.
Title Tag Duplication
Most of the designers don’t regard SEO and use the same title tag for all the pages in a website. This practice results in title tag duplication and mar SEO process. So you should make sure to vary tile tags on every page of your website.
Messed up Robots.txt
Create a file to keep your error log clean of robot.txt requests, but it also cause a mess up if you use it incorrectly. Here’s how it looks, assuming you don’t want to block ANY pages:
User-agent: *
Disallow:

Not Using Keywords in Internal Links and Navigation
Onsite links in a website also have much more importance as the external links have. If your home page has some authority then it will pass that authority to the internally linked page similar in the manner as outside site page rank to your home page. By linking from most powerful pages of your website to the internal pages with keyword-rich links, you’re doing exactly the same process as getting keyword-rich inbound links from high PR pages.
To make the most use of link power, make sure that your navigation consists of keyword-rich, targeted descriptions. Do the same with keywords scattered within content. Don’t worry about your footer; Google doesn’t put much weight on those.
Black Hat SEO Practices

Some of the SEO services providers also use black hat SEO services for the rapid results and increased PageRank. They use different tactics in its pursuit like keyword spamming, hidden key word stuffing, automated content generation and frames. But sometimes these tactics fire back and have a drastic result.

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