When starting to optimise the text for the site, remember some important rules: focus on the quality of your text.
Advantages in ranking will give only good, thematic, unique texts; the main phrase (keyword) in the document should be noticeable.
However, this does not mean that you should increase the density of words in the text. Moderate use of keywords, evenly distributed throughout the text, gives better ranking results; the structure of the text itself is also important.
One of the most convenient formats is considered to be journalistic: the article begins with a brief description of the content, then the text reveals first general and then private issues. It is better to conclude at the end.
Texts with this structure are valuable both as tools for search engine promotion (search engine optimisation of the site), and as informational materials.
Try to maintain its integrity. You can do this with CSS, and with the help of ordinary tables. Text, broken by the code into parts of the catalogues will not "appreciate" at face value; use keywords in optimising the site can be so: - in the thesis - 1-2 times, but the title should be readable, attractive; - in the title H1 - 1 time; - in the body of a small text is optimal 3 occurrences of the keyword / phrase, more - if the volume allows; several times the keyword / phrase can be highlighted in bold; - in the thesis to pictures - 1-2 times; - in the URL - 1 keyword, if possible; - in the thesis - 1-2 times, based on the situation.
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