Both forms and landing pages have reporting on submissions and conversions.
(See Why isn't my automation rule taking action when someone completes a form/landing page? for further explanation.)
Navigate to Reports > Landing Pages or Reports > Forms and click on the specific form or landing page to see its detailed report.
A conversion is when an anonymous visitor successfully fills out the form or completes the landing page and thus "converts" into a prospect, in other words a visitor with a known email address.
A submission is when the form or landing page has been successfully completed. This submission could be by an existing prospect or an anonymous visitor (who will then "convert" to a prospect upon completion).
For more, see these articles:
How are prospects converted from visitors?
- A conversion will also count as a submission but a submission might not necessarily be a conversion.
- A prospect could complete the same form or landing page more than once which would count as multiple submissions.
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