Which is the best backend programming language??
there is no such thing as "best" languag. All of them have pros and cons, I personally prefer JS (Node + Express).
Java or Python🤔
Java can also be used as a back end, but it isn't encouraged. Rather, it's used for web applications. https://softwareengineering.stackexchange.com/questions/102090/why-isnt-java-used-for-modern-web-application-development
how about java?
Python is a great choice.