How to connect front and Back end

I have created my front end using HTML, CSS, Javascript.
i want to connect it with python backend, HOW DO I DO THAT ?

Yeah, this was a logical leap for me when I started. There are a couple of different ways to do it, but the most common would be to have your f/e make http API calls to the server to give/get information.

I think Ajax and Json might come in handy in this case scenario, i suggest you go through this it might get you towards where you are going