<meta name="keywords" content=""/> This above Tag I add on my website but someone say the keyword tag is meaningless in my page and Google ignore this meta, So meta keywords are important yes or no?
At this moment, meta Keywords have no weight into your website ranking YES. Google and Bing state that they don't use it anymore. But if you already have them on your site, they'd not hurt you, so leave it perhaps other engines use it, just keep in mind not to have more than 12 -15 keywords for each page. I hope that helps!
As language master says, meta KW have no effect on Google rankings: Google's Matt Cutts has said so. Use them if you want: but bear this in mind: if someone wants to reverse engineer your site, the first thing they do is look at your meta KW. So watch you don't give the game away for no SEO benefit.