Well you're relatively new :). It takes time to absorb an entire language's ecosystem. As long as you take it upon yourself to acquaint yourself with those features, things will be fine.
The biggest thing to get on your initial survey should be minimal awareness so you know that that feature exists when you encounter the problem it was originally built to solve.
Supervision though, is fundamental to OTP and Erlang. It's certainly easy to learn so I would consider that a low hanging fruit for you.
Hot code reloading is a consequence of the continuation passing style that is prevalent in every Erlang process and easy to understand too (although employing it in production can be a bit trickier).
The biggest thing to get on your initial survey should be minimal awareness so you know that that feature exists when you encounter the problem it was originally built to solve.
Supervision though, is fundamental to OTP and Erlang. It's certainly easy to learn so I would consider that a low hanging fruit for you.
Hot code reloading is a consequence of the continuation passing style that is prevalent in every Erlang process and easy to understand too (although employing it in production can be a bit trickier).