Leverage lets you control a large position with a small deposit. At 1:100, $100 of margin controls a $10,000 position. Brokers advertise it as a gift; statistically, it is the single fastest way beginners destroy accounts. Both things are true. The difference is understanding what leverage actually changes.
Leverage amplifies exposure, not edge
Your win rate doesn't improve because you borrowed size. A 1% move for you is still a 1% market move. Leverage just multiplies its effect on your balance. At 1:100 fully deployed, a 1% adverse move erases the entire margin. That is not trading; it is a coin flip with fees.
The professional reframe
Skilled traders don't think "how much CAN I control?" but "what size keeps my loss at 1% if my stop is hit?" Leverage then becomes plumbing (a facility that lets a small account express a properly-sized position) rather than a throttle held wide open. Used this way, high account leverage with tiny actual exposure is perfectly safe.
Margin calls, demystified
Margin is the collateral locked for a position. If floating losses eat your free margin, the broker closes positions automatically: the margin call. Traders who size from stop distance and risk percentage essentially never meet one; traders who size from greed meet them monthly.
A sane starting point
Keep effective risk at 1% per trade regardless of the leverage available. Read Position Sizing to see the exact formula. It makes leverage almost irrelevant, which is precisely the point.
Education only, not financial advice. Trading carries risk of loss; never trade money you cannot afford to lose.
