Few SEO tips and tricks you should know about search engine optimization!

Keywords rule the game
Having lots of keywords in your page title or meta tags does not help at all. Spend some time on keyword research. Use smaller keywords as well as the larger keywords which will help generate traffic thus reducing the amount of work it would take to get the larger keywords. 'Smaller' keywords are those that have less competition whereas larger keywords have a very stiff competition.

Example:
Smaller keyword: SEO Services
Larger keyword: SEO

Include keywords naturally throughout the page, do not overuse, it will nullify any work you have done.

Example:
ICE Infotech, an SEO company, offers SEO services like link building, meta tag generation, content writing and other search engine optimization to assist your website in obtaining better search engine rankings.
Name files (images, media, documents, etc) and pages with search term.
Name the images with keywords/phrases signifying the images they represent "Web Design services.jpg". Do not forget to include alt and title tags thus adding more keywords. Apply this technique to Pages / Links also.

Alt and title tags allow for more keywords but do not spam, only use one keyword or a short descriptive sentence. These are also helpful for if your image is missing, it will show in place of the missing information. This also makes images,Pages/ Links more Search Engine Friendly.

Search engines only review approximately the first 65 characters of a title so its important to use your main keywords first.

Try to put your main keyword at the start of your title text like: SEO Services - Be more Search Engine Friendly
Utilize your meta keywords and description effectively
Example of meta keywords:
<meta name="keywords" content=" SEO services, SEO company, SEO link building, affordable search engine optimization company">

Example of meta description:
<meta name="description" content="Use our SEO company to help better your search engine optimization with meta tag generation, link building, content writing and more SEO services.">
Use descriptive page links
Your page links should have descriptive link text - instead of "home" use " SEO Services Home"

Categories can be your keywords as well like "SEO Link Building" or "All SEO Services".

You can use a title tag in the link code:
<a href="index.php" title="Go back to SEO services home">SEO Services Home</a>
Clean up and validate your code
Organize the code for better readability. This makes the code easier to understand, debug and Search Engine friendly. There should be no missing tags or information. All the JavaScript code should be moved to an external file and included in the calling page as below:

<script type="text/javascript" src="seo-services.js"></script>

This reduces the overall HTML page files size, keeps related JavaScript code together. Also if a page using an already downloaded JavaScript file is opened then the downloaded JavaScript file is reused. Thus reducing the data downloaded.

Visit the W3C and it will give you any errors that may pop up. Tidying up the errors can make the search engine happier. If there are any serious errors I would fix them so the search engines don't give up on crawling your site.
File size can affect your search engine rankings
The larger the html, code or page, the more time it takes to load. Ideally the Page Response Time should be around 3 secs. Any longer esp. for a static HTML page is a strict NO-NO. Use the point#2 to reduce size of the page if JavaScript is being used.
Using heading tags and emphasis tags like bold
Using emphasis tags can help tell the search engine what the most important topic is on your page. But use them sparingly as these might mess up the Page content making them an eye-sore.

<h1>SEO Services</h1>
<h2>We will help you get better search engine rankings for your website.</h2>