How many type of meta tags..?
 

How many type of meta tags:

Meta Keywords Attribute - A series of keywords you deem relevant to the page in question.
Title Tag - This is the text you'll see at the top of your browser. Search engines view this text as the "title" of your page.
Meta Description Attribute - A brief description of the page.
Meta Robots Attribute - An indication to search engine crawlers (robots or "bots") as to what they should do with the page.

Its simply meta tag title, description and keyword as well as meta robots in which you will use as an restriction to pages that are not needed to crawl.

There are four types of meta tags.