Web page on Raspberry Pi for setting temperatures

Hi!

I am a programmer, but with little experience in web programming.

I have a Raspberry Pi set up to control the heating in our house. I thought making a web page on it to set wanted temperatures was going to be easy. I have the layout, but how can I communicate the settings I enter on the web page to the program running to control the heating?

I thought the easiest way would be to simply write the wanted settings in a file, but that seems to be almost impossible, for security reasons?
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