On Page Optimization - Practice of Optimizing Various Aspects of Web Pages

If we are talking about SEO, these tags are very important. Tags support the overall theme placed in the title tag. Although there are some other HTML  tags too but while designing website, we commonly use H1 tags for important data. H1 tags are first level topics under the tile and H2 tags are sub topics that support whatever is there in H1.

Each header tag indicates the relative importance of each section it is heading: H1  is for the major sections of your document, or as the one header to the entire document. H2  is for the secondary sections of your document, etc. It's best to start with the highest level header H1 and work you way down.

For example it works like:

H1 The Universe - It's Big
H2 Our Milky Way Galaxy 

H3 Our Local Group of Stars

Large websites generally rank better than small websites for a number of reason. Search engines also like fresh content and will spider this more frequently. Keyword Density Keyword density is the ratio of the phrase to the total number of words, adjusting for the number of words in the phrase. When a certain phrase appears more than once, Keyword density SEO tool then calculates the  "Keyword Density" of that phrase.

In this way, you analyze both the keyword density and the proximity of the words. Density for a single keyword should be between 2 to 6% for relevant phrases and if it's too high, it may appear to be artificially stuffed and may be penalized as spam by the search engine. In addition to keyword density calculation, it verifies that your site is not overloaded and it has the correct distribution of profitable keywords in the most critical locations.

Web Design

The process of designing and developing a website is called Website Design. In  general, it's a group of activities which relate the creating the visual elements that a users see in their web browser, the selection and coordination of available components to create the layout and structure of a web page. Text, images, digital media and programming elements are shaped by the web designer to produce the page seen on the web browser. Today, many sites also integrate various forms of dynamic interactive content using E-Commerce, and server-side languages such as PHP (Hypertext Preprocessor), and ASP. Web design contrasts with Web development, which includes Web server configuration, writing Web applications, and server security.

Some important Links : Web Design India and Link Building Packages.