Use your targeted keyword phrase:
In META keywords. It's not necessary for Google, but it is still a good habit. Keep your META keywords short (128 characters max, or 10 keywords).
In a META description. Keep your keywords near the left but as part of a full sentence.
In the title at the far left, but not as the first word.
In the top portion of the page in the first sentence of the first full paragraph (plain text: no bold, no italic, no style).
In an H3 or larger heading.
In bold (second paragraph if possible and anywhere except in the first usage on the page).
In italic (anywhere except in the first usage).
In a subscript/superscript.
In a URL (directory name, filename, or domain name). Do not duplicate the keyword in the URL.
In an image filename used on the page.
In the ALT tag of the image.
In the title attribute of the image.
In link text to another site.
In an internal link's text.
In the title attribute of all the targeted links in and out of the page.
In the filename of your external CSS (Cascading Style Sheet) or JavaScript file.
In an inbound link on the site (preferably from your home page).
In an inbound link from off the site (if possible).
In a link to a site that has a PageRank of 8 or better.
Other search engine optimization issues to consider include:
Use "last modified" headers if you can.
Validate the HTML. Some feel that Google's parser has become stricter at parsing instead of milder. It often misses an entire page because of a few simple errors; we have tested this thoroughly.
Use an HTML template throughout your site. Google can spot the template and parse it off. (Of course, this also means it is pretty good at spotting duplicate content.)
Keep the page as an .html or .htm extension. Any dynamic extension is a risk.
Keep the HTML below 20 KB; 5 to 15 KB is the ideal range.
Keep the ratio of text to HTML very high. Text should outweigh HTML by a significant amount.
Double-check your page in Netscape, Opera, and Internet Explorer. Use Lynx if you have it.
Use only raw hrEFs for links. Keep JavaScript far, far away from links. The simpler the link code, the better.
More traffic will come once you realize that 1 referral a day to 10 pages is better than 10 referrals a day to 1 page.
Don't assume that keywords in your site's navigation template are worth anything at all. Google looks for full sentences and paragraphs. Keywords just lying around orphaned on the page are not worth as much as when they are used in a sentence.
Iran Engineering Reference Encyclopedia
www.smsm.ir