Because I’m in my very early 20s I missed out on the huge Java craze. Everything was Python when I started getting a more formal education and before then all my work was in C++. Knowing more languages would obviously look better on a CV but I mean if I would benefit in a practical sense? I have two friends who are long time Java devs. And recently another friend who generally works with legacy C++ based systems from the early 2000s late 90s period had to work on a bunch of stuff in Java. Java is clearly still in large scale use among older systems. So would it be likely that eventually I would need to work on Java systems myself when my job is mostly JavaScript currently?
This is good advice. Don’t be too much of a generalist to the point you know a lot of stuff badly, but also don’t corner into a technology and make it your identity.
Learn mainly the strengths and weaknesses of each language and tech you use, so you’ll know when you should pick something different for a specific project.