How can I find out what keywords a website is ranking for?

One of the best places to look for data like this is within the Google Search Console. Google will give you a wealth of ideas and ranking data in here. You’ll have to set it up and leave it to work for a while if you’ve not used it before. If you have, head over to the ‘Performance’ section and click on ‘Average Position’ for an indication of how you’re doing.

Here you’ll find the keywords typed into Google and how often you were shown in the results and where you ranked.