Explaining the Ranking of Google

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So basically the Google ranking is given by the PageRank algorithm that is like this:
PR(A) = (1-d) + d (PR(T1)/C(T1) +... + PR(Tn)/C(Tn)) where: PR(A) is the PageRank of page A, PR(Ti) is the PageRank of pages Ti which link to page A, C(Ti) is the number of outbound links on page Ti and d is a damping factor which can be set between 0 and 1.
Here we see some interesting things: PageRank does not rank sites as a unit. Instead determines for each page individually. Also, you can see that the formula is recursively, where the Pagerank of page A is defined by the PageRanks of those pages that link to page A. So something you should consider is inbound and outbound links.
Link submission is a crucial part of ranking in Google so I will explain to you how I get ready for this process: To start this process you will need some Anchor text and description that fit best your site. This is, create a few (5 o 6 to begin with) mixing keywords. Place the keyword both in the Anchor Text (title) and Description. Anchors usually can contain between 1 and 6 words and description can be up to 250 characters (this depends on the directory).
Later you can submit your site to many free Directories. Just Google search "Free Web Directories".
Here is also a small recommendation of SEO friendly directories that have really high Pagerank and can help you build a nice quality traffic:
1 ipl.org 2 dmoz.org 3 freeprwebdirectory.com 4 adirect2z.com 5 mastermoz.com 6 nuoret.org 7 searchsight.com 8 searchwiz.com 9 arakne-links.com 10 directory-free.com

Information like this will help you understand Google PageRank, and also improve your site ranking