Step2: keyword density + proximity
Hight keyword density
Moreover there should be a high density of your keywords in your text. Mathematically: keyword density = number of keywords / number of all words.
When a certain text ist relevant for a special theme, you could find the theme a lot of times in it. That is why search engins count all words for getting an impression what the text might be about. A rather bad example is the following because it is a bit exaggerated.
How search engins search for results and rank them
Why a high word density?
The is a quite nice artical by Matt Cutts about How does Google collect and rank results?
The following quote describes the approach of a search engine in a descriptive way:
Pretend that you’re a search engine. Pick a query like civil war or recycling or whatever you want. Search for the phrase on Google, pick three or four pages from the results, and print them out. On each printout, find the individual words from your query (such as “civil” and “war”) and use a highlighter to mark each word with color. Do that for each of the 3-5 documents that you print out. Now tape those documents on a wall, step back a few feet, and squint your eyes. If you didn’t know what the rest of a page said, and could only judge by the colored words, which document do you think would be most relevant? Is there anything that would make a document look more relevant to you? Is it better to have the words be in a large heading or to occur several times in a smaller font? Do you prefer it if the words are at the top or the bottom of the page? How often do the words need to appear? See if you can come up with 2-3 things you would look for to see if a document matched a query well. This can help students learn to evaluate website relevance the way a search engine would evaluate it so that they can better understand why a search engine returns certain results over others.
This might show why I mentioned the point of the high word density.But you should be careful and use a mediocrity.Do not overstate it! (Compare: Step 7: Avoid Spamming)
is following soon!