Hi,

For this either you can use the website form builder module which will record the data from the form to the specified model. The module is available in the odoo store for the community edition. You can get the module from this links : 

1.  HTML Form Builder

2. Website Form Builder

The other option is to do via coding, for this you have to create a template for the website form, and once the submit button is clicked the control will be passed to the route/controller specified in the form action. From the controller you can record the data to the corresponding model.

For more info regarding how to create the template and controllers for this see this documentation:  Odoo get web form or template value in controller

Thanks