1. Google Search Console
Let us start with a free tool from Google itself. Google search console is an SEO checker tool that helps you monitor, debug and optimize your website. This tool does an excellent job without you needing to code. As such, anybody can study, understand and use it.
The tool is robust and will give you a good view of how your website appears in organic search. It will reveal mobile usability, crawling, or any form of indexing issues on your website.
If you are interested in seeing Keywords your website is ranking for, you can count on this tool. Other related information you can get will include the click-through rate, position of your web page, impression and lots more.
2. Google analytics
Another great tool from Google, the good news here is that you can pair both Google analytics and Google search console. It will help you locate all of your SEO data in one sport, it will be easier to identify the area where you need improvement.
You can also take advantage of Google Analytics. Use it to compare your organic versus the non-organic traffic on your website, check the engagement on each of your post and pages and also filter your referral traffic for spam.