Mata tags special for search engine, it’s not visible to normal user. Meta tags writing is special technique for get ranking in search engine.
When you write Meta tag for particular page then you must take care of keywords. Meta tags improve your website search engine result pages (SERPs). When you want to represent your website in search engine in SERPs then you must write Meta tags for each pages of website.
Keyword is not repeating in description, title, keywords on each pages if you repetition of keyword it may be affect your rank in search engine. Or don’t include your company name in keyword, better way to include in description part of Meta tags.
Meta tags represent your site in search engine so it’s very important to create Meta tags on header of website. Meta tags are added in HTML format. Your Meta tags are based on you website content which is live on website. Means it’s compatible to your website content & Meta tags. I should say Meta tags is directly proportional to website content & it’s effect on SERPs results.