1. Creating a duplicate title tag is one of the most common mistakes in SEO work. The title tag is the words or phrases, which appear at the top of the browser when the page is displayed and is what the search engines display for the first line of the site link in their results. Search engines give a lot of importance to the title tags. When more than one page display the same title tag, the search engines discount those pages? importance.

2. Although Meta tags have off late lost their significance in the larger search engines, it is possible to misuse them, which in the long run damage the site. The biggest mistake with Meta tags is for the Meta description to be the same for every page. Pages with duplicate Meta descriptions can never fetch good rankings. The same goes for the Meta keywords tag. Only those keywords found on that page should appear in the keyword tag. Also, one has to remember not to put the same word in the Meta tag descriptions more than thrice.

3. Internal linking very often creates a big problem. Too many links in a site can force the search engine spider to quit indexing the site before it is actually finished. Google restricts a site from having not more than 100 links on a page. It is of course better to restrict it at 50 links.

For better SEO results, the links should always be made with text. Many web designers use images for their linking. This is not at all effective for optimization purposes. Another important to keep in mind is that the navigation system should never be in any form of java script, Flash, or image map.

It is always advisable to remember, not to stuff keywords by having too many links on the same page with the same word or words.

And last but not the least, it is important to keep multiple links on every page of your site has. Pages, which have only one incoming link, cannot expect good ranks. They may even be placed into Google's supplemental index. It can be difficult to work a page out of the supplemental index once it is in there.

4. Linking to other sites have to be done with lot of care too. Spamming has become such a problem that the search engines have really changed their algorithms with respect to linking. A musical instrument site simply cannot be linked to a kitchen apparatus site. The incoming links needed to be coming from related sites or sites with a similar theme.