It is not only language you have to learn. its ecosystem, environment, libraries, frameworks, tools, testing, debugging, paradigms, and etc.
Since mastering a language takes years, I use 20hrs rule. I spend 20hrs on reading, learning and practicing the language and environment itself and after that I dive directly into the project.
Since mastering a language takes years, I use 20hrs rule. I spend 20hrs on reading, learning and practicing the language and environment itself and after that I dive directly into the project.
(I've been programming 9+ years.)