how about Java? it's a small enough language that one can encounter and use every language feature within a few years of professional development, and without n

how about Java? it's a small enough language that one can encounter and use every language feature within a few years of professional development, and without needing to work in any obscure domain. admittedly, Java got a lot bigger in Java 8 and beyond. but it's still the language I'd put forward as "most possible to master".