Maybe you mean how to earn bitcoins? Cause bitcoins it's a money anyway 
But if you want to know who to get a fiat with bitcoin, you just need to exchange your bitcoin into fiat.
Correct bitcoin is already a money you can spend it but only in online, you can earn bitcoin by doing some task in exchange of bitcoin and also the best way with 100% profit is joining in signature campaign But if you want to know who to get a fiat with bitcoin, you just need to exchange your bitcoin into fiat.