The only way to master any subject it to Practice, practice, practice!
Get a hold of the basics first. If your basics are right, then it is just straightforward from there. I have come across many courses on edx and coursera for statistics. Engage in the discussion forums on those sites. Learn from others. Practice problems and get your hands on some good books in statistics. Mastering any kind of a subject takes long, so get started right away!
I have just started learning Statistics and right now I am trying to get my basics in place. I enjoy the subject a lot and it gives me great pleasure in working on data.
hope the answer may be sufficient
may god bless