I’m thinking wether to invest time into Erlang to level up or just go deeper into Elixir.
Learning Erlang made me a better Elixir programmer, and it’s not like You need to learn a new language, just this page is enough to understand syntax difference…
Also You will find some libraries, or some docs only available in Erlang.
The way I learned the most was when I translated some Erlang source code to Elixir.
The first one I did was tetris, by Joe Armstrong 
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I had a somewhat different experience. I focused on just Elixir but over time one will naturally meet and interact with Erlang code- but by then I had the basics down and reading code and docs in Erlang was trivial. Long story short, I don’t think that you should go out of your way to learn Erlang; instead the way will find you sooner or later
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