2. Meta Title
Your "meta title" information is added to the page source (i.e. your website coding) and is displayed to visitors in the topmost portion of the browser window.
Generally speaking, your meta title should include the two-to-three keyword phrases you are optimizing the page for and be kept relatively short (i.e. about 60-80 characters max).
3. Meta Page Description
How much your meta page descriptions affect your SEO is up for debate but there are other benefits to writing a good meta page description as well.
As a general rule, I suggest that your meta page description read well, contain the primary keyword phrase you are targeting and be kept to no more than 156 characters, including spaces.
Most of the time, the search engines will use your meta page description text when creating your search engine listing. The more exciting the text is, the better your chances of "getting the click."
4. On Page Content
They say that "content is King" but that's not entirely true. Poorly written content, or content that is "stuffed" with keywords will do much more harm than good.
For best results, your on page content should be well-written and unique to your site. It should also be tightly focused around the 2-3 keyword phrases you are optimizing for.
That's not to say that you should repeat your keyword phrases over and over, but that each page's content be more focused than broad.
5. Your Web Page URL
If at all possible, it's best to see that your urls include your primary keyword phrase.
For example, if you were targeting the term, "seo expert," it would be best if the url were something like: domain.com/seo-expert
As your url now includes the phrase, "seo expert," you help the search engines better understand the relevance of your page's content.