My Stocks is a great app. It records every coin you bought, how many of them, and the purchase price. It gives you the total. If you buy in stages, it gives you the average purchase price with more accuracy than Binance.

I bought a currency at 34$ and it is now down to 29$ and it is down, which means approximately 5$ loss (it is written that the daily profit and loss is one and ninety cents only

At first I did not pay attention to this point
I see that the currency was down by 20 and 30$ and I was looking and I found the daily profit and loss of a dollar or two and I said it was normal and I sold
I found the balance down and it was down a lot

That's why
I say to everyone who bought a new currency

Take a screenshot of its price

Or
Write down its price

So that you know your real loss after a while

Because I fell into this maze calculation