Gary Johnson and Aleppo

Laney
I've recently seen a lot of women on here saying they will be voting for the libertarian Gary Johnson. 
Now, I do not much about Gary Johnson at all. However, I just saw a video of Gary Johnson asking "what is Aleppo?" This was fairly surprising to me, seeing as I, an 18 year old girl with very little world/political experience, knew of the humanitarian crisis happening in Aleppo. 
This sparked my interest in the candidate. If he does not know of what is likely the worst humanitarian crisis happening today, what else is he unaware of? Not only was this incredibly disheartening, but it made me question very genuinely his ability to lead a nation. 
I would love to hear other thoughts on the situation! Also, if anyone would like to fill me in on Gary Johnson as a whole, I would welcome it as well.