How to save data from html (form register save user)?

Answer 1

It will require a backend.
To make this, you have to learn any backend language like python, Java or Php.
If you want to make a backend immediately within 2-3 days, just learn Firebase. Firebase provides free databases to users.
Even my website https://arnavgumber.github.io/codeinfinitewitharnav/ uses firebase database.

Answer 2

Thanks, I will try it.

Answer 3

Collect and send users' data to my website

Answer 4

Ok

Answer 5

Do you mean "save data to user's computer" or "collect and send users' data to the website owner". Tell me, I will answer it