Modern web is fairly complex but it doesn't have to be. What you're after is a simple form to submit that data to someplace. CSS and JavaScript in your case are only needed to improve the look and get some kind of dynamic feedback.
So you have the client webpage, this can be a really simple webpage without any style that just has several form tags (Reference: https://www.w3schools.com/tags/tag_form.asp).
Then you need to send this data to some place. You can use standard html actions to do this to a back end script, a rest api, or even to a formatted email that will be sent via the user's email client.
You may need node to code the back end if there isn't one you can use. You can also use google sheets. See example here: https://github.com/levinunnink/html-form-to-google-sheet. This is really only useful for a small prototype so at some point you would need to standup your own backend somewhere. That gets more complicated because now you need a script (could be JavaScript & node for example or PHP or anything else) which processes your form request and stores it to a database someplace else.
So you have the client webpage, this can be a really simple webpage without any style that just has several form tags (Reference: https://www.w3schools.com/tags/tag_form.asp).
Then you need to send this data to some place. You can use standard html actions to do this to a back end script, a rest api, or even to a formatted email that will be sent via the user's email client.
You may need node to code the back end if there isn't one you can use. You can also use google sheets. See example here: https://github.com/levinunnink/html-form-to-google-sheet. This is really only useful for a small prototype so at some point you would need to standup your own backend somewhere. That gets more complicated because now you need a script (could be JavaScript & node for example or PHP or anything else) which processes your form request and stores it to a database someplace else.
Good luck and happy coding.