Meta description, title, and keyword tags were made to tell search engines like google what your web pages are about, so the search engines can correctly direct visitors to or away from your site. Over the years people have abused these meta tags so much that they are not that important anymore. I still suggest using them, but do not harp on them too much. I, honestly, think the biggest value of meta tags is to put a descriptive summary of your post and then when you share that post on social media like Facebook the description will be listed. Check out the picture below.
You can google around for more information on SEO and the best practices. Here is a good page describing meta tags: Search Engine Journal – Meta Descriptions