"If you want to be a good developer then be good at one programming language." - I don't know why but I do not agree with this.

It doesn't hurt to know more languages and the language used should depend on the project.

And when you're good at that one, get good at another one.

I think the language used should be the one(s) you feel comfortable with but remember to never be afraid to step out of the comfort-zone for a bit to at least try something new and possibly better. Fuck a projects best use-case you are the consumer of languages, you drive what is best known as a standard. Code with the tools and languages you love and all your dreams will come true ☄🌝☄

...or you could end up homeless, selling handjobs on the corner; fuck if I know 🙃

We had a couple of guys from Capital One's tech dev team come in to give a talk a couple of weeks back and they gave some advice about this that really stuck with me.

They said that if you visualise your knowledge it should be shaped like a capital 'T' - that is, you should have a broad range of knowledge about different technologies and know one thing really, really well. This applies particularly well to web dev, but I feel it's pretty relevant to other parts of the industry as well.

Master few, be confident in many,
And know when to use the right one for the project at hand.

Just be good at what are you doing.

@FoolsGambit Agreed !! :D