Google Analytics
One of the most popular and reliable ways to track website traffic is through Google Analytics. This free tool is available to anyone with a Google account and provides detailed information about a website's visitors, including their location, device, and referral source. To use Google Analytics, you'll need to sign up for an account and then add the tracking code to your website. Once it's set up, you can view your website's traffic data in the "Audience" section of the dashboard.
Web server logs
If you have access to the web server where your website is hosted, you can view the server logs to see how many visitors it receives. These logs contain a record of every request made to the server, including the IP address of the visitor and the pages they visited. You can use a tool like GoAccess to parse the logs and generate a report of your website's traffic.
Website traffic estimation tools
There are also a number of online tools that can estimate a website's traffic based on publicly available data. Some popular options include SimilarWeb, Alexa, and Quantcast. These tools use algorithms and other data sources to provide estimates of a website's traffic, although the accuracy of these estimates can vary.
Ask the website owner
If you don't have access to any of the above methods, you can always try reaching out to the website owner and asking them directly. Many website owners are willing to share their traffic data, especially if they have a business relationship with you.
