It is a concise introduction to bitcoins in technical and business aspects.
It covers top altcoins and significant events.
Not for coin trading/investment.
I am from IT sector and totally not new to bitcoin or technical terms/concepts.
Still I learnt a lot from two-days reading 119 pages in 4-5 hours. You cannot get this kind of concise information in one-place (May be that I don't know such source).