Being an "expert" in bitcoins is very hard to attain because the word itself means perfection or at least almost. The way I think to become an expert is by studying as much as possible, you should read all the articles about bitcoins from the very beginning up to now, research all the related topics to this (including economics, finance etc.) and become familiar with them because you can't only stick to the idea of bitcoin itself, you should also know where and how can it be applied in different aspects of life.

But the secret ingredient to become an expert is EXPERIENCE. I believe that experience is the best teacher, that's why high ranking members here took years of studying and dealing with bitcoins; now look at them, they are so cool because it seems that they knew everything. Either your experiences are good or bad, it all matters because these things mold you to be a good bitcoin earner and to become an expert sooner.