A Washington Post story from 2015 stated there "are at least 7,102 living languages in the world". The story went one to say that Englash is spoken in more countries than any other language at 101 counties. English is also the most widely used 'official' language at 35 counties, and it's " by far the world's most commonly studied language".
a person who has acquired the knowledge of computer science, the study of the theoretical foundations of information and computation and their application
Acording to the website DZone there are "256 programming languages, from
Z shell". For me, it all started with an early model of programmable HP calculator. First it was the HP-25, then it was a HP-33E and on to the HP-16C, and the the HP-41CV, which I still use today. And while I've learned a few dozen computer lanauges,
Z80 Assembly; i've forgotten more than most people learn.
a scientist who specializes in the theory of computation and the design of computers
The correct use of an operating system is another thing to be learned. Be it OS/360 and TSS/360 on old IBM mainframes, or CP/M and IBM PC DOS which was in fact Microsoft's MS-DOS on the next generation of personal computers, and it was on to Windows and it's versions. Then you have the world of Apple, with Mac OS and iOS on the phones. Plus our good old friend, Unix, and it's Linux branchs, when extend in to the phone with Android. It's a never ending march forward.
If you want to talk geek with me, contact me.