The lot size refers to the amount of a financial instrument being traded in a forex transaction. In the context of forex trading, the standard lot size is usually 100,000 units of the base currency. There are also mini lots, which are 10,000 units of the base currency, and micro lots, which are 1,000 units of the base currency. In the context of Bitcoin trading, lot sizes may differ, so it is important to check the specific lot size used by your broker. The value of a lot size will affect the potential profit or loss from a trade, so it is an important factor to consider when managing risk in forex trading.
here is an example for your lotsize
for GOLD(XAU-USD) 0.01 lotsize equals “1” euro
so it you enter a trade on 1900 with lotsize 0.01, and the market goes to 1910, you made 10euro
if you enter BTC-USD with 0.01, the maket has to move 100 numbers to make 1 euro, so of you enter BTC with 0.01 lotsize at 50.000 and the maket moves to 51.000, you made 10 euro