Are you an expert in anything?

[flackbait]

I suppose I'm decent in History (it is my major in college), but the only portion I've really mastered would probably be WW2 history and even then I'm always learning something new about it.

[asimpson2006]

I'm not yet an expert, but I am a pretty skilled martial artist, even though I haven't practiced in 4 years.  My dad says I know a few things about auto racing (mainly referring to who drove with what teams, and things about chassis and engine combos)