As you might see some experts in trading lose their whole capital, so…?
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I’m not aware of any trading experts that would lose all their capital. If someone loses all their capital they are only an expert in losing and not an expert in trading. The first major rule of trading is to learn risk management and all expert traders will first and foremost be experts in risk management.
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expert in losing 
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the luck evens out in the long run
you have to make sure that the run is long enough to be confident of that realistically happening
and “making sure that the run is long enough” is really another way of saying “making sure that your risk management is appropriate and safe”
so that’s the primary skill at which you have to be an expert, exactly as wisely mentioned by @Pauley1 above
that’s in addition to having a genuine, proven edge, which in turn means you have to know how to tell whether you have a genuine, proven edge, which means you need a good understanding of the relevant probability math/stats
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The long run is long enough to realistically see what happened.