5
SEO mistakes are:
1. using a non-standard title element - A standard element is recommended that include one or two of a web site’s keywords and a reference to the page’s fundamental content within the first three to five words (It’s okay to include variations on one of the web site’s keywords.)
2. failing to optimize image markup - common mistakes of webmasters today. So many talented PhotoShop gurus create wonderful banners, background art, and other images then add them to their pages in a way that means spiders will ignore them!
3. using spider-illegible JavaScript where legible code would do - a “deals” web site that aggregated hot deals from around the Internet. Because it pulls is content from a variety of sources, the web site regularly has fresh content, which search engines love. However, the problem was that the site’s aggregator used JavaScript.The point is quite simple: keep JavaScript use to the bare minimum, using it to enhance the user experience, perhaps, but not to display content that you want the search engines to see.
4. failing to indicate the content hierarchy using header elements - As most SitePoint readers know, header tags (h1, h2, etc.) have a clear purpose: they establish a web site’s important sections and the content hierarchy. Yet, along with title elements and image descriptions, correct heading hierarchies are among the most underutilized SEO tools.
5. poor grammar and spelling - The Google Librarian Center is Google’s greatest strategic move in years, yet the organization has largely downplayed the project’s importance. Through its open partnership with librarians, Google is gaining allies in the battle to develop algorithms.
Source: Jonathan Smith - SEO
