After reading this article you will know:
How to create a form
How to save the values in your application
Create a GET endpoint containing the form-html
Make a POST endpoint with the proper input variables, corresponding with the name html-tags in the GET.
Create an action event in the POST endpoint to process your data.
Create another action event to define what the user sees after submitting the form. (A redirect or render web template)
Try it out and enjoy!