Abra is one of the best course if you want to learn cryptocurrencies, this teaches you in a simple but very fast way since it is destined in a 10-day course, the advantages of ABRA is that it teaches you in that period of time very I cut things like, what is a cryptocurrency, how to use it, how to exchange and it lets you know when it is convenient to invest to generate income safely.
These courses are virtual and teach you from the most basic to the most complex of a cryptocurrency, ABRA is one of the shortest intensive courses there is. The truth is that its educational structure seemed very explanatory and easy to understand.