Hi Michal, thanks for the reply. That's true, but with crypto you only have USD or BTC. Based on those earnings, it calculates backwards if your "local" currency is different, but even that fluctuates against the USD.
The problem is that you buy currency X in BTC, let's say 1 BTC. Now in USD, that coin is now worth double, making it 100% more, but BTC went up in price and you sell coin X for 1 BTC. Although in USD it made a profit, it has the same BTC back. Now BTC falls in value and you got 0 BENEFITS.
I concluded that as soon as the coin is purchased, measure in USD. If it sells, don't sell while BTC is rising or rising, but definitely sell if BTC is down, hahaha, then you will get more.
It is difficult because BTC changes to USD and the alternative currency it exchanges will vary in value based on the value between BTC and USD. I like the USDT (the altcoin to match the USD) but it is only on two exchanges and is not accepted as the base currency, plus they had a security breach. Okay, they're taking action and over the table, but they still pose a bit of a risk.
So for me I think it's still a juggling game to find my feet hahaha