To learn how to invest it would be good to read all the books you can of Warren Buffet, and also a book by Tom Williams who advise very well about investment. There is another very good book by Jhon Glatt called "The Little Book that still beats the market."
Great books recommendation but the one who have posted here should consider it and try to read all the ways explained in these books. It is a type of user guide which will let you know all the ways from getting start with it and ending up with a nice finish. The main thing to consider is to check the long term trusted store of value of a particular currency or coin, if it has then investment will be productive.