If you read the define meta tag in html into blogger article’s heading , it will be useful for you to know what is the importance of meta tag. You can read the use of html meta tag article for know how meta tag works in web page.
In wordpress , you can easily define meta tag. You need take help from a wp plugin. I am using wp yoast plugin for myself. So, I am going to show you ,how you can create meta description and meta keyword for your site by this plugin.
Yoast Plugin For Define Meta Tag
At first install the wp yoast plugin into your site. Go to your wordpress dashboard>plugin> wordpress SEO> titles & metas . After that you can see something like the following image. If it seems small image to you , you can see the full image from here.
Here you can see meta description temple and meta keyword template . You have to write your meta description and meta keyword here. You can use html code here.We have edited this for us. You have to edit this for you. you can link your Google plus page also.
This is a simple way for define meta tag into wordpress. You can create your main keyword blod of your website.