So lets say I put in $100 dollars. I buy while its at a low of $10,400. The price goes up to $10,400 and I sell. Whata my profit?
In the example that you give you got no profits at all, however there are two ways to calculate profits, one is in BTC and the other is in fiat and which one prefers depends on your views, many prefer to view their profits in fiat since they are going to exchange their coins and they want to see how much fiat they earned with their trades and investments, but many people like me prefer to calculate our profits in bitcoin since we are not going to exchange our coins anytime soon.