Any time I start using a new language I always start with "Hello world" and working a few simple example programs to get my head around the syntax, idioms, and common data structures. But yes, don't spend a ton of time on this, as soon as you have a sense that you know what to do, start tackling actual work.

If the languages are at all commonplace, having an AI convert a program from language X to language Y might speed you along as well. No guarantees it will be perfect but it will probably get you in the ballpark.