Not advice. This calculator does simple maths with the numbers you type. It does not know where a price will go.
Position size and risk
Decide how much you can lose first. The calculator tells you how much to buy.
Loss and recovery
A loss needs a bigger gain to recover. This is why small losses matter.
What if the price moves
See your profit or loss for different moves.
Price impact of an order
In a thin pool a big order moves the price against you. This is a simple estimate for a standard pool.
Practice it
Try your numbers with virtual money before you use real money.