Best we can do here is suggest you read the documentation and user postings, get stuck in and use it or look to buy some training. Atlassian have started running some online training courses, and their partners have run other course for a long time, including face-to-face tutoring (seek a partner in your area if you want on-site training obviously)
I should add that I work for a UK partner (Adaptavist) and I've recently been sitting through some training courses. I've now contributed to one of them, and helped deliver three.
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