I still dont know what you want to know. you can also not just ask &quot;How to learn about fiat money&quot; and expect helpful information.<p>If you want to know how Bitcoins work, start with the Satoshi Whitepaper and proceed from there. 
I am sure it will automatically lead you to other resources when you try to understand some parts of it.<p>If you just want to use them, just use them, there is not really much knowledge needed for that.<p>If you are interested in the anonymity of it, look around the Darknet market communities.<p>If you just want to be involved in a general Bitcoin community, try Bitcointalk