Meta tag keywords is not important for Google, but there is a small connection with your position. If you will try to find right keywords to your page, you should be on the top.
Count of keywords in meta tag Description is important by 5.4%. More keywords is good. But you should think about right lenght, it is more than 100 and less than 160 characters.
95% of head tags, that creates WordPress are bad. It differs how, it is about 5.72% up to 7.76%. All these headers are for page navigation, but for what? Users don’t see them.