Jack of all trades means that you have a broad spectrum of knowledge but not deep knowledge in a specific field. If you are a very talented individual you can h

Jack of all trades means that you have a broad spectrum of knowledge but not deep knowledge in a specific field. If you are a very talented individual you can have both broad and deep knowledge. The trick here is that the definitions of "deep" and "broad" vary a lot depending on who you ask to. As stated in other comments, there are people that consider "broad" knowing how to write JS for web pages and a (simple) NodeJS backend and other that think you have a broad knowledge if you know how an eBPF script works in the kernel and also how the V8 engine optimizes your Javascript in the browser, and all the layers in between.