There are many When I started seo I used to use - Soovle Answer the public Google keyword planner (just run one low budget ad) Uber suggest (older version) Keyword shitter Keyword everywhere (it's paid now) And then I used to use urlsmatch tool to analyze competitors content, and get keyword ideas from that Link assistants website auditor can also help with that Google related keywords Google SERP Also, nowadays I am using seo ruler. pro These all can help if you are working in small scale, if you are working on large scale then I think you can also buy paid tool