Appendix A — Trading mechanics 101

The main book assumes you already know how to place a trade. This appendix is for the reader who doesn't yet — the on-ramp. If you've never sized a position or set a stop, read this first; the rest of the book will then make sense. If you trade already, skip it.

Nothing here is gold-specific. It's the universal machinery of leveraged trading, explained once, plainly.

Price, pips, and the quote

XAUUSD means "the price of one ounce of gold (XAU) in US dollars (USD)." A quote of 4,558.20 means one ounce costs $4,558.20. When gold "moves a dollar," the per-ounce price changed by $1.00.

You'll see two prices: the bid (what you can sell at) and the ask (what you can buy at). The ask is always slightly higher; the gap is the spread — your instant cost of trading (Ch 35).

Long and short

Long = you bought, betting price rises. Profit if it goes up.
Short = you sold (something you don't own, borrowed via the broker), betting price falls. Profit if it goes down.

Gold can be traded in both directions with equal ease — being able to short is why traders, unlike investors, can profit in falling markets.

Lots, contract size, and what a "point" is worth

Position size is measured in lots (for CFDs/spot) or contracts (for futures). The key number is how much one dollar of gold movement is worth to your position — the value per point.

A standard CFD lot is often 100 oz → a $1 gold move = $100 P&L.
A mini lot might be 10 oz → a $1 move = $10.
A COMEX future (GC) is 100 oz; the micro (MGC) is 10 oz.

Always know your value-per-dollar before entering. It's how you translate "my stop is $26 away" into "that's $X of risk."

Leverage and margin

Leverage lets you control a large position with a small deposit. At 20× leverage, $5,000 of your money controls $100,000 of gold. The margin is the deposit the broker holds against the position.

Leverage cuts both ways and is the number-one way beginners blow up. At 20×, a 5% move against you wipes out your entire margin. The metal barely moved; your account is gone. Leverage is not the edge — it's the amplifier. Use far less than the maximum offered.

The three orders you must know

Market order: buy/sell now at the best available price. Fast, but you accept whatever the next price is (slippage).
Limit order: buy/sell only at a price you specify or better. Patient; you wait for price to come to you. The professional's entry tool (Ch 35).
Stop order: an order that triggers when price hits a level. Its most important use is the stop-loss — an order to exit a losing trade automatically at a pre-set level, so a bad trade can't become a catastrophic one.

The stop-loss — the most important habit

Before you enter any trade, you decide the price at which you're wrong and place a stop-loss there. This does two things:

It caps your loss at a known amount — you can never lose more than planned (barring slippage/gaps, Ch 35).
It lets you size the position rationally (next section).

A trade without a stop is not a trade; it's an open-ended bet that can take your whole account. The discipline of always having a stop is the difference between traders who last and traders who don't.

Risk, "R," and position sizing

This is the concept the whole book hinges on, so learn it now.

Risk per trade (R): the dollar amount you'll lose if your stop is hit. You decide this first, as a small % of your account — typically 0.5%–1%.
From R and your stop distance, you derive the position size:

Position size = Risk dollars ÷ (stop distance × value per point)

Worked: $10,000 account, risking 1% ($100) per trade, stop $26 away, value $100 per $1 move:

$100 ÷ ($26 × $1 per oz per $1 move... ) 
→ size so that a $26 adverse move = $100 loss
→ ≈ 3.85 oz  (e.g. a 0.04-lot CFD position)

You never pick size first. You pick risk first, then size follows from the stop. This is why "R" is the unit the book speaks in: a +2R trade made twice your risk; a −1R trade lost it. Expressed in R, every trade is comparable regardless of account size.

Putting it together — the minimal trade

Form a view (this book's Parts I–IV).
Find an entry and the price that proves you wrong (the stop).
Decide your risk (e.g. 1% of account).
Derive position size from risk ÷ stop distance.
Place the entry (limit), the stop-loss, and a target.
Let it run; don't move the stop further away; journal the result.

That's the whole machine. Everything else in the book makes it better — but this is the irreducible loop.

Common mistakes (beginner edition)

Using maximum leverage because the broker offers it — the fastest path to a blown account.
Trading without a stop-loss — one bad trade then takes everything.
Picking position size first ("I'll buy 1 lot") instead of deriving it from risk and stop.
Moving the stop further away when price approaches it — converting a small planned loss into a large one.
Confusing margin with risk — your risk is the stop distance, not the margin posted.

Key takeaway

Decide your risk first and let position size follow from the stop — leverage is an amplifier to use sparingly, and a trade without a stop-loss isn't a trade.