What does it mean when vacancies are written: to know one language or another?

Question

Distant work

Hello.
Why do many vacancies write: know Python or Java, C# or Go, PHP or Node and etc.. How to understand this? Is it enough to know one language from this? Well, they must have something basic, or how does it work? As you can see, I have no experience in this matter.

Answer 1

In most cases, this means that the project for which they are looking for a candidate has not yet started. those. when they find it, this person himself will start the project in the language that he knows.