Keyword research tools are online platforms that can help you discover, analyze, and compare keywords for your content. There are a variety of keyword research tools available, such as Google Keyword Planner, SEMrush, Ahrefs, Moz, and Ubersuggest. Each tool offers its own features and benefits, but they all share some common steps to help you refresh your old content with keywords. To begin, you should identify your old content that needs updating using tools like Google Analytics, Google Search Console, or Screaming Frog. Then analyze the current keywords of your old content with tools like Google Keyword Planner, SEMrush, or Ahrefs. After that, research new keywords for your old content using tools like Ubersuggest, Moz, or AnswerThePublic. You should also look at the keywords that your competitors are using for similar content and see how you can differentiate yourself. Once you have done this step you can select the best keywords for your old content with tools like SEMrush, Ahrefs, or Moz. Then update your old content with the new keywords using tools like Yoast SEO, Hemingway, or Grammarly to optimize it for readability and clarity. Finally make sure to update your title, meta description, headings, images and links with the new keywords and ensure they are consistent and natural.