#ID: They are unique definitions and has to be used once in HTML file.If it is used twice or more, page will give markup error.IDs are usually used in main parts of the layouts such as header,container and footer.

.CLASS: Classes are able to be used more than one in a web page without any markup errors.They are usually used in sub elements of IDs.

An example usage:

#header {
width: 100%;
height:50px;
margin:0;
}
.bannerone {
width:468px;
height:60px;
display:block;
}

As you can see, we can repeat .bannerone class as much as we want.
If you are new on web developing then you will understand the difference asap.

(According to the example below I assumpt you already have a website added to your WM tools account)

1- Go to Sitemaps page under Site configuration dropdown.

2-  Now click on ‘Submit a Sitemap’ button to notify Google.

3- Write down your sitemap.xml (http://domain.com/sitemap.xml) and wait for Google to get notified.

- For WordPress users;

You will be able to create your sitemap.xml with a plugin called ‘Simple Google Sitemap XML‘ autmatically.It is great

Today’s one of the most powerful and most useful blog engine is WordPress.Instead of power, it is 100% open-source and now more than a blog engine by deep-hearted supporters.The flexibility of the system gives power to the back-end user to do same thing just like popular CMSs do.

Let’s see Why and How;

1- Smart & Simple

The engine itself gives entire control to the user.It has very simple administration page with no complication.With one day of working on, you can get how things go around on the system.

2- Flexible

Easy to adapt it to websites from micro sites to e-commerce solutions, portfolios and even company websites.By the help of its Codex, with average knowledge of html,css and php, it is so easy to integrate the design and the engine to any web or mobile page.

3- Secure

A lot of huge companies choose it to use as their blogs or it is used in a small part of their portal (as listed here).Even suprisingly Microsoft Turkey (competitor of linux systems) choose it on their blogs.

4- Unique SEO

As search engines give much care to the keyword based SEO scores, it has effective help for your website to rank up.Variety of tons of 3rd party plugins simplifies Search Engine Optimization.

5- Plugin & Theme Support

It has huge plugin and theme repository.Officialy, there are +16,000 plugins and +1,400 themes listed on their Extend page.

6- Up-to-date

The up-to-date upgrade system allows back-end users to upgrade any major or minor upgrade released by WordPress with one-click.Also plugins can be upgraded on administrator panel when available as well.

7- Mobile Usability

WordPress is also working on mobile devices with mobile supported themes.It is a must for newbies to care about mobile devies as approximately %10 web traffic is coming from mobile at the moment.If your theme does not fit mobile devices, it can be created with a plugin support.

Moreover, it is Open Source. If you are motivated then you are good to GO!