How many types of Meta Tags and their characters limits ?
 

How many types of Meta Tags and their characters limits ?

In meta description it should not increase more than 125 words and in key words also it will be around 20-30 that too in a proper way which are related to your web page content.

In cloaking, website that returns a different webpages to search engines crawling the site. In other words, a human reading the site would see different content or information than the Googlebot or other search engine robot reading the site. This type of method is performed to rank their pages well in search engines. This is one of the black hat seo method.

Meta tags are those tags, describe about our website and give information about our website. We used to generally 3 following tags as meta tags:
Title(May be and may not be in meta)
Description
Keywords
but no a days it includes more tags in meta like geo meta tags, language specific meta tags etc.

For futher details read Google Webmaster Support Page

Meta descriptions can technically be any length, but Google generally truncates snippets to ~155-160 characters. It's best to keep meta descriptions long enough that they're sufficiently descriptive, so we recommend descriptions between 50 and 160 characters.

I would like to suggest that there are two main kinds of tags there:

1) Title Tag: This tag is important for Google because it informs both people and search engines about the website's content, and we can use primary keywords in it.

2) Description Tag: Description Tags are also one kind of tag, where we need to write a short description for the website so that search engines as well as people can learn about it.

Meta Title - 50-60 characters
Meta Description - 150-160 Characters

Yes, when we update the meta tags, we can keep the title at 50–60 characters and the description at 150–160 characters.

In Meta Title 50-60 characters and meta description 150-160 characters limit.