what is this form thing? Why? How?

Hi, welcome to JotForm.

JotForm is an online form builder.

For more information, you can check this guide:https://www.jotform.com/faq/

You may create your first web form by following this guide:https://www.jotform.com/help/2-how-to-create-your-first-web-form

If you have further questions, let us know.