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A factor 50 for a SEO1st keyword in the title of the page.
2nd keywords in the page header (h1, h2, h3, etc.).
3rd keywords in domain names.
4th keywords in the file name of the picture page or other content that search engine ranking factors.
5th keywords in bold, italics and underlined text.
6th keywords in ALT text for images.
7th keywords in the text a different color / size.
8th variety of keywords in the page (such as: eat, ate, consume, eat the food, etc.).
9th density of keywords on the page.
10th appearance of the keywords on the page in half.
11th keywords in meta description tag.
12th keywords in the keyword meta tags.
13th identification of the name description and keyword pages of other websites.
14th age of the domain.
15th Page of age.
16. TLD domain (eg:. Domains will be in a better ranking in Google.co.in domain).
17th host location.
18th Page Rank websites.
19. The quality of content (good writing, unique information), search engine ranking check list.png.
20. Number of Backlinks.
21. Quality (PR) of Backlinks.
22. Anchor text for links back.
23rd title text (if any) for Backlinks.
24th Age of Backlinks.
25th Back to the link page. (On the bottom of the page boldface).
26th is the content or links with other links. (Point to other sites and only separated by some text [such as, "" or "|"]).
The 27th link in the total number of pages that you linked.
28th's theme is linked to that page as linked pages.
29th of relevant keywords on the main site's overall.
30th site load time. (Server response time and size of the page).
31. The benefits of server (99.99% uptime those things).
32nd outgoing links (who you connect? Related?).
33rd of pages on the site.
34th navigation and access to sites. (- To ease the ability of every page).
35th link to the page within. (Yes, this will improve the ranking of the main page as well if the navigation is correct.)
36th how many people return to the site from search engines after searching for keywords. (I keep track of the Google Toolbar on this).
The 37th link in the page number within your pages (not more than 100).
The 38th number of external links on your web page (try to reduce).
39. Backlinks from. Gov,. Edu links (some think it is not a factor).
40. Use "-" hyphen (and "_" underscore) in your file names to the area.
41. Often the site is updated.
42nd duplicate content from other sources (negative effect).
43rd links to bad sites. (Called bad neighborhood) (negative effect).
44th keywords in that page or the optimization (negative effect).
45th and created a new link for the site. It is consistent over the long term?
46. Backlinks from DMOZ and Yahoo directory are considered quite valuable.
47th Session avoid identifiers (SID).
48. Delete page (dead link on the site) is redirected 301/302 (negative effect).
49. HTML to validate the document. (I'm not sure how much of it).
50th History of the domain. (What made it bad in the past?).
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