Free-form integration to the website
With freeform you can install some demo templates from which you can see how it works:
https://docs.solspace.com/craft/freeform/v3/setup/demo-templates.html#installing-the-demo-templates
You can also render your form with: {{ craft.freeform.form(&quot;formHandle&quot;).render() }} 
Some additional info on that and additional custom formatting can be found here: https://docs.solspace.com/craft/freeform/v3/overview/formatting-templates.html