Total capital in your trading account.
$
Pros stick between 0.5% and 2%. Start small.
%
How many pips from entry to your stop.
pips
Used to calculate pip value in USD.
Pair you're trading.
1 standard lot is 100,000 units. 0.1 is mini. 0.01 is micro.
lots
Pips between entry and target (or entry and stop).
pips
Total capital in your trading account.
$
The 1 to 2 percent rule keeps drawdowns survivable.
%

Pip values assume a USD account and use approximate FX rates. Confirm with your broker before sizing a real trade.
Nothing here is financial advice.