You can create forms for various purposes be it collecting information or generating leads using Magento 2 Custom Form Builder Extension. Forms like Contact Form, Request for Quote Form, Manufacturer Support Form, Registration Form etc, can be created with this extension.

Read this configuration guide on How to Install and Configure Custom Form Builder to Magento 2.

Here are the few useful resource to help.
1. How to Set Up and Enable Contact Us Form in Magento 2?.
2. How to Customize Contact Us Form in Magento 2?.
3. How to Validate Forms in Magento 2?.
4. How to Add a Custom Field in Magento 2 Registration Form?.