Recommendations for backend [closed]

I'm just starting to do some backend as hobby, but I have a big question,

Would it be better to learn a server-side language like NodeJS or PHP or try to have a website in HTML, CSS and Vanilla JS and run my Python scripts from there?

I have been using Python for a year and a half and I'm new in the web development and I haven't learn PHP or NodeJS so I would like your recommendations on this