There are several free keyword research tools available online that can help you identify relevant and valuable keywords for your website or content. Here are some options:
1. Google Keyword Planner: This is a free tool provided by Google that allows you to search for keywords and provides data on search volume, competition, and suggested bid.
2. Ubersuggest: This is a free keyword research tool that helps you generate keyword ideas and provides data on search volume, competition, and CPC.
3. Answer the Public: This tool provides a visual representation of the questions and phrases people use to search for a particular topic.
4. Keyword Tool: This tool provides keyword suggestions for various platforms such as Google, Bing, YouTube, Amazon, and more.
5. Google Trends: This tool allows you to see how often a particular keyword is searched over time and provides data on related topics and queries.
6. Keywords Everywhere: This is a browser extension that provides search volume, CPC, and competition data for keywords on multiple websites, including Google, YouTube, Amazon, and more.
7. Moz Keyword Explorer: Moz offers a free version of their keyword research tool, which provides data on search volume, difficulty, and opportunity.
These tools can be used to find relevant keywords for your content, and can also help you identify gaps and opportunities in your industry.