Adding Meta tag to your website is the first thing you need to do if you want to increase your search ranking. Meta tags will help your site easier to be found by search engine.
Understanding Meta tags (this is what I got from this video) :
* Meta tags provide metadata about the webpage
* They are not displayable on the page but will be machine parsable
* Meta elements are usually specified into three types : meta descriptions , meta keywords and meta title / author
* Meta tags sit within the and tags.
For more information about Meta tags, you are welcome to watch video bellow. Make sure you watch to the end and gain useful information from it.