How does the web page visiting journey capture leads?

How does the web page visiting journey capture leads?

I have set up the web page visits tracking journey template in Marketing Hub. Since it has been activated I have had people visit our website, but no leads or data has been collected and entered this journey. How exactly does the "visiting any website page" trigger capture visitor information? Any why am I not capturing any of the current visitors information that have visited our website since activating this journey?