Yes. You won't really know python or javascript until you learn C. You may gain some empirical knowledge about how various parts of those languages operate, b

Yes. You won't really know python or javascript until you learn C. You may gain some empirical knowledge about how various parts of those languages operate, but without knowing C, you won't understand the "why". If you understand the "why", you'll occasionally be able to intuitively see solutions that would never have occurred to you otherwise. Those are the sorts of key problems that can make all the difference in the success of the project and of your career. Any language you learn will make learning additional languages easier and faster. But, the boost you get from learning C is arguably greater than for other languages. It's also the single most powerful backup language you can know.