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Well, that is a complex question because good PR might be interpreted differently by people and webmasters. PageRank is one of the items Google considers to give websites ranks and it is possible to add a lot of quality links to your website and its PR score is still low but nowadays rankings are more important than increasing the PR scores.

Search engine friendly URLs could be always cool but since this is going to be one of the on page optimization elements webmasters are using, so the effects on rankings would not be huge. For instance nowadays tens of thousands of blogs can be found with SE friendly pages details but not all of them are on the first page of Google for their terms specified.

Nowadays most part of SEO is being done through addition of links from other sources and so, it would be logical t replace the templates and custom web development packages by better ones even several times a year and without any impacts on the ranks. Some things need to remain the same like the wordings on pages, the title tags for instance are so important.

Please note that sitemaps are not like a necessity and for example if your pages are well connected to each other, usually more than one text link being used to connect them, you can forget about addition of XML sitemap or even HTML ones to your website. Subdomains are like folders or decisions of the sites which can get promoted professionally by addition of links.

If you are talking about the Google engine, the matter of keyword density seems to be an ancient story because nowadays the incoming links and authority level of the websites would determine who comes first on the first page. Simply adding a lot of words to the page copies will not change anything.

The navigational structures of the websites play essential roles in here. For example, if you have a lot of content pages and yet Google has indexed only a few of them, do not forget addition of some HTML and static sitemap pages to your site containing links to those resources.

Google already knows about the so called black hat SEO methods some people may be using and therefore they may no longer work out these days. Once you realize that they are mostly related to the on page items and that Google nowadays favors the links and not just what goes on on the sites pages, so you would only stick to the white hat and legitimate optimization tasks.

When you notice this fact that PageRank is only one of the tens of items Google considers to give websites ranks, so you would figure out how some low PR sites are found on the first page of Google and outperforming their high PR competitors. It is possible to acquire some high quality and relevant web links which may come from zero PR sites or pages.

The idea of writing articles and then gaining some cool one way backlinks seems to be really great and no wonder some of the top quality blogs have become world famous because they simply are being read by thousands of people a month and a lot of backlinks would be pointing at the articles published.

Using the SEO tips your website would gain benefits from better and improved rankings. Nowadays the search engine optimization experts believe that the addition of quality links to the information rich websites can be among the major elements to help boosting their web ranks.

Well, the validated codes might not be that important actually but fresh contents are definitely great. By searching the net you would find a lot of top Google ranking sites which contain a lot of coding errors.

I guess you are talking about the on page optimization elements. They can cover sections like writing unique title tags for each of the pages, using some H1 tags and a low keyword density because higher percents would not work.

The tags like description and keywords might not be that important today but titles are still very important and probably would remain so even in the future. One way of telling what subjects the sites are about is to look at their titles and the search engines pay attention to the title tags.

If you are going to launch several websites and intend promoting and maintaining them quite differently and separately, there is nothing wrong using a single host for all of them, especially nowadays when most powerful hosting accounts allow hosting actually tens of sites.

By starting with the less competitive terms your success chances could improve considerably. The point is that when your site is new and naturally not having many links and content pages, by beginning targeting the longer terms and sentences, some top rankings would be gained faster and then gradually you could move towards the top terms.