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Google Analytics can be used to track website activity such as session duration, pages per session, bounce rate etc. of individuals using the forms, along with the information on the source of the traffic.
Google Tag Manager
Google Tag Manager is a free tool that allows you manage and deploy marketing tags (snippets of code or tracking pixels) on your forms without having to modify the code. Information from one data source (your form) is shared with another data source (Analytics) through Google Tag Manager.