Just made some money but don't know how ...

Just this morning i found out that there has been a good increase in my balance. It is not that the price of $CVC had shot up much or $XRP or $ID for that matter. I really dont know how it happened. So I am wondering how. What did i do most recently?

I only joined one #Binance​ program like that. My first gain was $7.77 then it began to move ...

PS: I have just been made aware of #write2earn by binance and I am wondering how it works . ..