Welcome to the community, @Spix_dsa!
You didn’t say what form software you’re using, but your #1 easiest solution would be to create an Airtable form and then embed it on your website.
Airtable’s support website has documentation on creating forms, and I cover forms extensively in my free Airtable training course.
If, for some reason, you’re stuck using whatever form software you’re currently using, then you will likely need to use some sort of integration software like Make.com to get the proper values from your form into Airtable. That can take quite a bit of skill & time, so I would recommend trying to first go down the easy path of using Airtable’s forms.