Identifying keyword is very much easy. You can use Google SEO tools and other free or paid tools also.
You can analyze keywords from Google search console which will allow you to quickly and easily identify the keywords that are driving traffic to your website. However, Google Analytics gives you access to see paid traffic on your website. You can take a look at Google ads>>keywords.
Also, there are many types of free tools that will help you in finding new keywords to target with your SEO content as well as for your PPC campaigns.
Analyzing the keywords may refine your SEO efforts as after doing this you can target high traffic keywords in your paid search campaign and can capture additional traffic from relevant searches.