Add meta tags

[kamino410]

We should adjust meta tags to suit search engines.

• <title>
• <meta name="description" content="*********">
• <meta name="keyword" content="aaa,bbb,ccc">

reference : https://saruwakakun.com/html-css/basic/meta-tag

[narugit]

I read your reference link.
I think we should not use "keyword" meta tag or even if we use it, we should add at most one keyword.
It's because it is not useful in Google engine and if we set more than one keywords, it may cause bad SEO.

references

• https://www.seo-ch.jp/news/582
• https://www.google.co.jp/amp/s/wacul-ai.com/blog/seo/internal-seo/seo-keyword-number/%3famp