How Build An Interactive And Responsive Website From Scratch

Hi. I have little knowledge about HTML and last year i went through and introduction to Python. But now i urgently need to start building an interactive website and possibly an app for a community business start up. I don't have the funds to hire someone to do this for me so i want to design and code it myself. I imagine the task is enormous for someone who's not an IT profession. But am hoping there is a way i can do it with minimal mistakes and setbacks
Please, i welcome any ideas on where i can begin.

welcome
https://shiny.rstudio.com/tutorial/

Thank you @nirgrahamuk