Keywords are very important not only as quantity but as quality as well - i.e. if you have more keywords in the page title, the headings, the first paragraphs - this counts more that if you have many keywords at the bottom of the page. The reason is that the URL (and especially the domain name), file names and directory names, the page title, the headings for the separate sections are more important than ordinary text on the page and therefore, all equal, if you have the same keyword density as your competitors but you have keywords in the URL, this will boost your ranking incredibly, especially with Yahoo!.
- Keywords in URLs and File Names
The domain name and the whole URL of a site tell a lot about it. The presumption is that if your site is about dogs, you will have "dog", "dogs", or "puppy" as part of your domain name. For instance, if your site is mainly about adopting dogs, it is much better to name your dog site "dog-adopt.net" than "animal-care.org", for example, because in the first case you have two major keywords in the URL, while in the second one you have no more than one potential minor keyword.
When hunting for keyword rich domain names, don't get greedy. While from a SEO point of view it is better to have 5 keywords in the URL, just imagine how long and difficult to memorize the URL will be. So you need to strike a balance between the keywords in the URL and site usability, which says that more than 3 words in the URL is a way too much.
Probably you will not be able to come on your own with tons of good suggestions. Additionally, even if you manage to think of a couple of good domain names, they might be already taken. In such cases tools like the Tool below can come very handy.
File names and directory names are also important. Often search engines will give preference to pages that have a keyword in the file name. For instance http://mydomain.com/dog_adopt.html is not as good as http://dog-adopt.net/dog-adopt.html but is certainly better than http://mydomain.com/animal-care.html. The advantage of keywords in file names over keywords in URLs is that they are easier to change, if you decide to move to another niche, for example.
- Keywords in Page Titles
The page title is another special place because the contents of the <title> tag usually gets displayed in most search engines, (including Google). While it is not mandatory per the HTML specification to write something in the <title> tag (i.e. you can leave it empty and the title bar of the browser will read "Untitled Document" or similar), for SEO purposes you may not want to leave the <title> tag empty; instead, you'd better write the the page title in it.
Unlike URLs, with page titles you can get wordy. If we go on with the dog example, the <title> tag of the home page for the http://dog-adopt.net/ can include something like this: <title>Adopt a Dog - Save a Life and Bring Joy to Your Home</title>, <title>Everything You Need to Know About Adopting a Dog</title> or even longer.
- Keywords in Headings
Normally headings separate paragraphs into related subtopics and from a literary point of view, it may be pointless to have a heading after every other paragraph but from SEO point of view it is extremely good to have as many headings on a page as possible, especially if they have the keywords in them.
There are no technical length limits for the contents of the <h1>, <h2>, <h3>, ... <hn> tags but common sense says that too long headings are bad for page readability. So, like with URLs, you need to be wise with the length of headings. Another issue you need to consider is how the heading will be displayed. If it is Heading 1 (<h1>), generally this means larger font size and in this case it is recommendable to have less than 7-8 words in the heading, otherwise it might spread on 2 or 3 lines, which is not good and if you can avoid it - do it.
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