Tools
Two tools you can actually use
Both are pure front-end: the maths happens on your device, nothing is uploaded, nothing is logged, and there's no login. Open and go.
Fee calculator
Enter your order size, pick a rate, tick the BNB discount and the invite-code rebate, and see right away what one trade really costs and roughly how much a year of trading saves.
Position & stop-loss calculator
Decide the most you'll lose on this one trade first, then work back to how much to buy and where to put the stop. A beginner's first lesson in managing risk.