To determine if a visitor is from a Google AdWords click, you can set up tracking with a UTM parameter in your destination URL. UTM parameters are tags that you can add to a URL to track different elements of your campaign.
Here's how to do it:
Your destination URL should look something like this: https://www.example.com/?utm_source=google&utm_medium=cpc&utm_campaign=my_campaign_name&utm_term=my_keyword&utm_content=my_ad_id
In your custom report, add the "Source" and "Medium" dimensions and filter by "google/cpc" to see AdWords clicks specifically.
With this set up, when a visitor clicks on your AdWords ad and lands on your website, you'll be able to see in your Google Analytics data that they came from a Google AdWords click.
Another way to determine if a visitor is from a Google AdWords click is by using the Google Ads Conversion Tracking feature. Here's how to do it:
Once the conversion tracking is set up, Google Ads will track each visitor who clicks on your ad and completes the desired conversion action. You can then view this data in your Google Ads account under the "Conversions" tab.