Value Investor?

[CityFarmer]

Unknown Unknowns are the scariest part of it all.
In a lot of cases, there is no way of preempting it and as some cases have proven that even the safest of safe can fail. (And never recover).

It's a case of the more I learn, the less I realize I know. Only way of eliminating this risk is to diversify sufficiently and not to place a large portion of you wealth into something you have no control over.

I concur on the need of diversification, as a hedge to "Unknown Unknowns" and also mistakes.

The quest now is, what is the "sufficiently"?

Is diversify to 10 stocks of different sectors sufficient? Or we need to diversify into 100 to suffice? etc. etc.