What are the most important things to consider to get a site highly ranked on search engines such as google? Also are - and numbers not good to use in domain names eg www.joe-blogs21.com ??

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Here's a few "basic tips" to get a site highly ranked on search engines such as google:

(1) Write a Title tag for each page that accurately describes that page (no more than about 64 characters).

(2) If you want to rank well for the phrase "electric widgets," then do everything you possibly can in order to make your site the best resource about electric widgets available. i.e. Link to quality relevant sites. Also, after you do so, make sure to ask those sites to link to you, but don't make your links to them contingent on whether they link back.

(3) Make sure all of your pages are accessible through normal links (i.e., don't use JavaScript or Flash links exclusively).

Here are some of the attributes that your webpages need to be considered "quality" by a search engine:

(1) The page is relevant to the terms being searched for

(2) The page is considered an authority about its topic

(3) Relevancy -- How well a page matches a user's query

(4) The page has good, useful content

(5) The page has been around for a while

(6) The page is part of a site with lots of information