From my experience, becoming good at a particular language or framework doesn't necessarily make you a better developer. Coding experience and building a good programmer mindset by learning from more experienced developers and reading books like Clean Code does make a difference.
I have been coding in many languages and, at some point, you realize that they are all just abstractions to solve common problems: get an element, call a service, print this string, update data, etc.
So I partially agree with you in that you should try to learn one thing at a time (three things max is my rule). But first and foremost focus on the fundamentals and don't be afraid to play around with new technologies and occasionally jumping off your learning path and try something entirely new (say, Machine Learning). You never know what new opportunities may come from it!
Agree. As Bruce Lee put it...
Don't get set into one form, adapt it and build your own, and let it grow, be like water. Empty your mind, be formless, shapeless — like water. Now you put water in a cup, it becomes the cup; You put water into a bottle it becomes the bottle; You put it in a teapot it becomes the teapot. Now water can flow or it can crash. Be water, my friend.
I definitely think fundamentals are an essential thing to learn.
I guess the point I was trying to make is that if you work with, let’s say one framework, for a long enough time. You will eventually master the in and out of it. And when you reach that point, you will start to focus less on the framework itself and more on how it was built and how it solve common issues. And that’s when, at least for, I really got passed the framework and start working with real concept like design pattern for example.
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