I am doing doing SEO for my blogspot blog these days,so is still worth adding meta tags for each page of blogs and websites?
You should only use the meta description tag and the meta robots tags (use meta robots only if necessary). Even though the meta description tag isn't used for rankings, it is very important because it will be the first description a user will get of your website when you first appear as SERPs. So having a short, precise, and appealing meta description is very important. For the meta robots tag, I would recommend using it only if necessary. Use it to give certain restrictions to search engines like not to follow any links on your web page or not to index your web page and so on.