Learning about Cryptocurrencies can be an Overwhelming thing to do!
That is why I have divided the learning process into sections, for an easier understanding.
So where to really start then: I would definitely recommend starting of with some simple Books !
After reading some books you should go to the Academy to gather some more advanced knowledge about how everything works.
Go to Learn and Earn to get some Free Crypto maybe, see how that works.
Sign up for Courses maybe get some Certificates along the way, and finally Learn to Code the Blockchain.