Module 1 · Learn Trading
How Markets Actually Work
Prices, spreads, orders, and who's on the other side.
Before reading charts, it pays to know what a chart is a picture of. A market is an auction that never ends, and every candle in every later module is just this auction's minutes. Ten minutes here saves years of confusion about fills, spreads, and "manipulation" that is usually just plumbing.
What a price actually is
The price you see quoted is simply the last trade that happened. The tradeable market is two other numbers: the bid, the highest price a buyer is currently offering, and theask, the lowest price a seller will accept. You buy at the ask and sell at the bid, always. The gap between them is thespread.
That toll is charged on entry and exit, win or lose. In liquid large stocks it's pennies; in small stocks, exotic options, or overnight crypto it can be a percentage of the whole trade. Frequent trading in wide-spread markets loses money before any analysis gets a vote, which is why professionals obsess over liquidity before setups.
The three orders that matter
A market order says fill me now at the best available price: guaranteed execution, unguaranteed price. Alimit order says fill me at my price or better: guaranteed price, unguaranteed execution. A stop orderwaits dormant until price touches a trigger, then becomes a market order; it is how exits from Module 0 get automated. The stop-limit variant becomes a limit order instead, which protects against a bad fill but can leave you unfilled in a crash, an important trade-off to decide calmly, in advance.
Slippage, gaps, and other honest physics
Slippage is the difference between the price you expected and the fill you got, and it grows with speed, size, and thinness. Gaps happen when news lands while a market is closed or when price simply jumps levels: a stop order triggers at its trigger, but fills at the next available price, which can be meaningfully worse. None of this is a scandal; it is what an auction looks like under load. Your sizing math should assume a little slippage as a cost of doing business.
Who is on the other side
When your buy fills, someone sold to you. Usually it's amarket maker, a firm whose business is quoting both sides and earning the spread while staying hedged; sometimes it's an institution working a large order in slices, or another trader, or an algorithm reacting in microseconds. The practical lesson isn't paranoia. It's respect: prices are set by participants with faster tools and tighter costs than yours, so your edge will never come from outracing them. It comes from patience, sizing, and picking the few moments where preparation beats speed.
Where the ebook goes deeper
Part II of The Complete Trader walks the full machinery with worked numbers: reading a quote, what the spread costs at your size, choosing order types deliberately, and the liquidity checklist a trade must pass before sizing even starts.
Questions, answered straight
Why did my order fill at a different price than I clicked?+
You paid the spread, and possibly slippage. A market order buys at the ask, not at the last printed price, and in fast or thin markets the ask can move between your click and your fill. Limit orders trade certainty of price for certainty of execution.
Should beginners use market orders or limit orders?+
Learn both, because they answer different questions. A limit order says 'only at my price or better' and risks not filling. A market order says 'now, at whatever the book offers' and risks a worse price. For a liquid market and a small size, either is fine; knowing WHY you chose one is the skill.
What is liquidity in simple terms?+
How much you can buy or sell without moving the price. A liquid market has many resting orders near the current price, so your trade barely dents it. Illiquid markets have thin books, wide spreads, and prices that jump; they are where beginners pay the most invisible tuition.