The question every leveraged position must ask before existing: where does it die? Isolated margin estimate, ~0.5% maintenance — every exchange uses its own parameters.
Size isn't chosen: it's computed. Given capital, risk % and stop distance, you get quantity, notional and effective leverage — the number that actually matters.
The invisible cost of long-held perpetual positions: a "small" funding every 8 hours, annualized, is a double-digit toll. Positive = longs pay shorts.
What a monthly accumulation plan becomes at a hypothetical annual return. Warning: you supply the return assumption — try negative values too, because the market signs no contracts.
Expectancy, break-even win rate, track record sanity checks and the cost simulator are on the Debunking page.
The why behind every formula — with the real cases — is in the Guides and the book.