Here is one way to check: view your website in a Chrome browser, right click, pick the option to Inspect and run Audits (for both desktop and mobile). You will get a headline report.
SEO should be in the green numbers. Should this not be true revisit your website and page descriptions/ key words; ensure these accurately reflect your website content. This is about getting the basics right - results taken from https://hypnosis-retreat.co.uk
Thereafter, take a look through Google's advice https://support.google.com/webmaster.../7451184?hl=en. It's is a long read!
There are many SEO tools, but if you hit 100% in this test you will be in good shape!
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