So I am a bit confused about how to properly use keywords on my website. Let me be more specific about my confusion. 1. I created some articles for my website, but I am not sure how to put keywords on meta tags for that article/page. Should I better define keywords using my own opinion about article/page or better use a keyword checker for my page/article and see which of the words are commonly(mostly) used( if a kind of program or script exists)? 2.How to know about most paying keywords about a specific topic without paying to know that?